Copiar e Editar

Biology 2420 Medical Microbiology Test 2

Descrição

Quiz sobre Biology 2420 Medical Microbiology Test 2, criado por bconstance em 12-10-2014.
bconstance
Quiz por bconstance, atualizado more than 1 year ago
bconstance
Criado por bconstance mais de 9 anos atrás
203
0
0

Resumo de Recurso

Questão 1

Questão
In microbiology the term growth usually refers to an increase in
Responda
  • a microbe's size.
  • the number of microbial cells.
  • the amount of ATP produced.
  • the number and size of microbial cells.
  • the number and size of microbial cells and the amount of ATP produced.

Questão 2

Questão
A cell that uses an organic carbon source and obtains energy from light would be called a
Responda
  • photoheterotroph
  • lithoautotroph
  • photoautotroph
  • chemoheterotroph.
  • chemoautotroph

Questão 3

Questão
A(n) ______________ organism is one that requires oxygen for growth.
Responda
  • anaerobic
  • facultative anaerobic
  • aerotolerant
  • obligate aerobic
  • both aerotolerant and anaerobic

Questão 4

Questão
An aquatic microbe that can grow only at the surface of the water is probably which of the following?
Responda
  • a phototroph
  • a heterotroph
  • a chemotroph
  • a lithotroph
  • an anaerobe

Questão 5

Questão
Which of the following forms of oxygen is detoxified by the enzyme catalase?
Responda
  • singlet oxygen
  • hydroxyl radical
  • peroxide anion
  • superoxide radical
  • molecular oxygen

Questão 6

Questão
All of the following are used to protect organisms from the toxic by-products of oxygen EXCEPT
Responda
  • carotenoids.
  • superoxide dismutase
  • peroxidase
  • protease.
  • catalase.

Questão 7

Questão
A microbe that grows only at the bottom of a tube of thioglycollate is probably a(n)
Responda
  • obligate aerobe.
  • facultative anaerobe.
  • aerotolerant anaerobe.
  • microaerophile.
  • obligate anaerobe.

Questão 8

Questão
Nitrogen is growth limiting nutrient for many organisms because
Responda
  • it is necessary for the biosynthesis of amino acids
  • it is required for synthesis of nucleotides.
  • it is required for lipid synthesis.
  • only a small number of bacteria are able to extract it from the atmosphere.
  • only a few microbes can extract it from the atmosphere, but all organisms require it for amino acid and nucleotide synthesis.

Questão 9

Questão
Which of the following growth factors would NOT be required by microbes which do not utilize electron transport chains?
Responda
  • heme.
  • selenium.
  • NADH.
  • vitamins.
  • amino acids.

Questão 10

Questão
At temperatures higher than the maximum growth temperature for an organism,
Responda
  • proteins are permanently denatured.
  • membranes become too fluid for proper function.
  • hydrogen bonds within molecules are broken.
  • hydrogen bonds are broken, and proteins are proteins are permanently denatured.
  • hydrogen bonds are broken, proteins are denatured, and membranes becomes too fluid.

Questão 11

Questão
Human pathogens are classified as
Responda
  • thermoduric.
  • thermophiles.
  • mesophiles.
  • hyperthermophiles.
  • psychrophiles.

Questão 12

Questão
The term barophile refers to which of the following growth requirements?
Responda
  • hydrostatic pressure
  • temperature
  • nitrogen source
  • pH
  • osmotic pressure

Questão 13

Questão
Which of the following organisms would be most likely to contaminate a jar of pickles?
Responda
  • a neutrophile
  • a thermophile
  • an acidophile
  • an obligate anaerobe
  • a mesophile

Questão 14

Questão
Organisms that can grow with or without oxygen present are
Responda
  • obligate aerobes.
  • facultative anaerobes.
  • aerotolerant anaerobes.
  • obligate anaerobes.
  • either facultative anaerobes or aerotolerant anaerobes.

Questão 15

Questão
A fastidious organism might be grown on which of the following types of media?
Responda
  • transport media
  • reducing media
  • enriched media
  • differential media
  • selective media

Questão 16

Questão
Obligate anaerobes may be cultured in the laboratory
Responda
  • in a reducing medium
  • in a candle
  • in standard Petri plates.
  • on blood agar plates
  • on blood agar plates in a candle jar.

Questão 17

Questão
Joan wants to discover a microbe capable of degrading an environmental contaminant. Which of the following refers to the process she should use?
Responda
  • chemostat
  • quorum sensing
  • enrichment culture
  • nitrogen fixation

Questão 18

Questão
A microbiologist inoculates a growth medium with 100 bacterial cells/ml. If the generation time of the species is 1 hour, and there is no lag phase, how long will it be before the culture contains more than 10,000 cells/ml?
Responda
  • 24 hours
  • 7 hours
  • 2 hours
  • 3 hours
  • 10 hours

Questão 19

Questão
An epidemiologist is investigating a new disease and observes what appear to be bacteria inside tissue cells in clinical samples from victims. The scientist wants to try to isolate the bacteria in the lab. What culture conditions are most likely to be successful?
Responda
  • culturing on blood agar plates
  • inoculation of EMB plates
  • incubation in a candle jar
  • inoculation of cell cultures
  • inoculation of a minimal medium broth

Questão 20

Questão
Which of the following measurement techniques would be useful to quantify a species of bacteria that is difficult to culture?
Responda
  • membrane filtration
  • viable plate counts
  • MPN
  • microscopic counts
  • metabolic activity

Questão 21

Questão
MacConkey agar plates represent __________ medium.
Responda
  • a minimal
  • a selective
  • a differential
  • both a differential and a selective
  • both a minimal and a selective

Questão 22

Questão
A Petroff-Hauser counting chamber is
Responda
  • a glass slide containing an etched grid for counting microbes directly using a microscope.
  • a device that counts cells as they interrupt an electrical current.
  • a device that measures the amount of light that passes through a culture.
  • an apparatus that traps bacterial cells on a membrane filter where they can be counted.
  • a device used to count numbers of bacterial colonies on a Petri plate.

Questão 23

Questão
Another term for the logarithmic growth of bacterial cells is
Responda
  • generation time.
  • exponential growth.
  • arithmetic growth.
  • absorbance.
  • binary fission.

Questão 24

Questão
A device that removes wastes and adds fresh medium to bacterial cultures in order to prolong the log phase of a culture is called a(n)
Responda
  • Coulter counter.
  • cytometer.
  • spectrophotometer.
  • pellicle.
  • chemostat.

Questão 25

Questão
A specimen of urine is determined to contain 30 bacterial cells per microliter. How many cells would be present in a milliliter?
Responda
  • 3
  • 300
  • 30,000
  • 3,000
  • 30 million

Questão 26

Questão
Which of the following is NOT a direct method for measuring the number of microbes in a sample?
Responda
  • viable plate counts
  • turbidity
  • Coulter counter
  • MPN
  • membrane filtration

Questão 27

Questão
During which growth phase are bacteria more susceptible to antimicrobial drugs?
Responda
  • lag phase
  • log phase
  • stationary phase
  • death phase
  • the susceptibility is the same for all phases

Questão 28

Questão
The use of salt and sugar in preserving various types of foods is an application of which of the following concepts?
Responda
  • nitrogen fixation
  • osmotic pressure
  • pH
  • hydrostatic pressure
  • quorum sensing

Questão 29

Questão
A clinical sample labeled as "sputum" was collected from
Responda
  • the skin.
  • the blood
  • the central nervous system.
  • a piece of tissue.
  • the lungs.

Questão 30

Questão
The method of obtaining isolated cultures that utilizes surface area to dilute specimens is called
Responda
  • the pour-plate technique.
  • serial dilution.
  • the streak-plate technique.
  • transport media.
  • enrichment culturing.

Questão 31

Questão
__________ are complex communities of various types of microbes that adhere to surfaces.
Responda
  • Aggregates
  • Colonies
  • Isolates
  • Biofilms
  • Media

Questão 32

Questão
A colony-forming unit is the number of cells
Responda
  • in a colony.
  • that produces one colony.
  • in a particular specimen.
  • that is in exponential phase in a culture.
  • that can be placed on a Petri plate.

Questão 33

Questão
All of the following ingredients might be found in complex media EXCEPT
Responda
  • hydrogen peroxide.
  • yeast extract.
  • blood
  • soy extract.
  • milk proteins.

Questão 34

Questão
Sodium thioglycollate is associated with which of the following types of media?
Responda
  • transport media
  • differential media
  • complex media
  • reducing media
  • selective media

Questão 35

Questão
Which of the following quantification techniques can distinguish living cells from dead cells in a culture?
Responda
  • microscopic counts
  • dry weight
  • metabolic activity
  • a Coulter counter
  • turbidity

Questão 36

Questão
During the __________ of growth, new cells are being produced at the same rate as other cells are dying.
Responda
  • lag phase
  • log phase
  • death phase
  • stationary phase
  • intermediate phase

Questão 37

Questão
During the __________ of growth, cells are dying faster than new cells are being produced.
Responda
  • death phase
  • lag phase
  • log phase
  • stationary phase
  • longitudinal phase

Questão 38

Questão
When cells are metabolically active but not dividing, they are in the
Responda
  • stationary phase.
  • log phase.
  • lag phase.
  • death phase.
  • exponential phase.

Questão 39

Questão
Metabolic activity is at maximum level in the __________ of growth.
Responda
  • lag phase
  • log phase
  • death phase
  • stationary phase
  • intermediate phase

Questão 40

Questão
Cells are rapidly growing and dividing during the __________ of growth.
Responda
  • death phase
  • lag phase
  • log phase
  • stationary phase
  • indeterminate phase

Questão 41

Questão
An organism that tolerates high __________ is called a halophile.
Responda
  • hydrostatic pressure
  • salt concentrations
  • pH
  • carbon dioxide levels
  • oxygen levels

Questão 42

Questão
A capnophile is a microorganism that thrives in conditions of high __________.
Responda
  • carbon dioxide levels
  • hydrostatic pressure
  • oxygen levels
  • pH
  • salt concentration

Questão 43

Questão
A microorganism found living under conditions of high __________ is a barophile.
Responda
  • pH values
  • oxygen concentrations
  • hydrostatic pressure
  • carbon dioxide levels
  • salt concentrations

Questão 44

Questão
Microaerophiles are microbes that grow best at low
Responda
  • carbon dioxide levels.
  • pH values
  • hydrostatic pressure.
  • oxygen levels.
  • salt concentrations.

Questão 45

Questão
An acidophile thrives under conditions of low
Responda
  • carbon dioxide levels.
  • salt concentrations.
  • oxygen levels.
  • hydrostatic pressure.
  • pH

Questão 46

Questão
All of the following are associated with nucleic acid structure EXCEPT
Responda
  • ribose
  • hydrogen bonds.
  • uracil
  • ionic bonds.
  • phosphate

Questão 47

Questão
Which of the following is found at the 5 end of a DNA strand?
Responda
  • a phosphate group
  • a hydrogen bond
  • a hydroxyl group
  • histones
  • a methyl group

Questão 48

Questão
The bacterial chromosome is
Responda
  • usually circular.
  • found in a nucleoid
  • found in a nucleus.
  • both circular and found in a nucleoid.
  • both circular and found in a nucleus.

Questão 49

Questão
Which of the following types of plasmids allows a bacterial cell to kill its competitors?
Responda
  • virulence factors
  • fertility factors
  • bacteriocin factors
  • resistance factors
  • cryptic plasmids

Questão 50

Questão
Which of the following is NOT involved the packaging of eukaryotic chromosomes?
Responda
  • nucleosomes
  • histones
  • heterochromatin
  • euchromatin
  • Okazaki fragments

Questão 51

Questão
Which of the following statements is true of bacterial plasmids?
Responda
  • They are found in the nucleoid.
  • They can replicate autonomously
  • They carry genes for essential metabolic functions.
  • They are small circular DNA molecules.
  • They are small circular DNA molecules that can replicate autonomously.

Questão 52

Questão
DNA helicases
Responda
  • break hydrogen bonds between complementary nucleotides.
  • synthesize short DNA molecules important for the function of DNA polymerase.
  • seal gaps between DNA fragments.
  • proofread DNA molecules.
  • assist in recognition of promoters during transcription.

Questão 53

Questão
Which of the following statements concerning transcription in bacteria is FALSE?
Responda
  • It occurs in the nucleoid region.
  • Sigma factors are parts of RNA polymerase that recognize promoter regions.
  • The same RNA polymerase transcribes primer RNA, mRNA, tRNA, and rRNA.
  • Termination is either self-induced or due to the presence of Rho protein.
  • There are a variety of sigma factors that affect transcription.

Questão 54

Questão
Which of the following is involved in translation?
Responda
  • rRNA
  • tRNA
  • mRNA
  • both mRNA and tRNA
  • mRNA, rRNA and tRNA are all involved.

Questão 55

Questão
Which of the following is a characteristic shared by DNA and RNA polymerases?
Responda
  • efficiency of proofreading
  • type of nucleotides used
  • direction of polymerization
  • speed
  • dependence on helicase

Questão 56

Questão
Which of the following is the strongest base pair?
Responda
  • guanine-cytosine
  • adenine-uracil
  • adenine-thymine
  • guanine-thymine
  • both adenine-uracil and adenine-thymine

Questão 57

Questão
A codon is a particular combination of three nucleotides. Therefore, there are __________ possible combinations of the nucleotides A, C, G, and T.
Responda
  • 16
  • 4
  • 12
  • 64
  • 32

Questão 58

Questão
The AUG codon functions in coding for the amino acid methionine and as a
Responda
  • termination signal.
  • start signal
  • "wobble" codon.
  • marker for introns
  • recognition site for RNA polymerase

Questão 59

Questão
Which of the following must be removed from a eukaryotic mRNA molecule before it can be translated?
Responda
  • promoter
  • exon
  • intron
  • anticodon
  • codon

Questão 60

Questão
A charged tRNA first enters the ribosomal __________ site and then moves into the __________ site.
Responda
  • A, E
  • P, A
  • P, E
  • A, P
  • E, A

Questão 61

Questão
Which of the following statements regarding eukaryotic transcription is FALSE?
Responda
  • Transcription occurs in the nucleus, mitochondria, and chloroplasts (if present).
  • Multiple transcription factors are required.
  • There are four different RNA polymerases.
  • Multiple elongation factors are required.
  • A guanine is added to the 3 end, and a poly-A tail is added to the 5 end of the mRNA transcript.

Questão 62

Questão
Semiconservative DNA replication means that
Responda
  • each daughter DNA molecule is composed of one original strand and one new strand.
  • nucleotides are constantly being recycled as cells make DNA.
  • the cell can proofread its newly synthesized DNA only part of the time.
  • the sequence of a DNA molecule is preserved as it is being replicated.
  • each strand of a double-stranded DNA molecule is replicated differently.

Questão 63

Questão
Which of the following is NOT a characteristic of Okazaki fragments?
Responda
  • They are checked for accuracy by DNA polymerase III.
  • They make up the lagging strand of replicated DNA.
  • They begin with an RNA primer.
  • They are joined together by DNA ligase.
  • They are longer in eukaryotic cells.

Questão 64

Questão
The proofreading function of DNA polymerase III results in an error rate of __________ during DNA replication.
Responda
  • 1 error in 1,000 bases
  • 1 error in 100,000 bases
  • 1 error in 1 million bases
  • 1 error in 10 million bases
  • 1 error in 10 billion bases

Questão 65

Questão
Which of the following processes is involved in the "central dogma" of genetics?
Responda
  • translation
  • transcription
  • DNA replication
  • transcription and translation
  • DNA replication and translation

Questão 66

Questão
Inducible operons
Responda
  • are active in the presence of a repressor
  • are generally anabolic pathways
  • are normally active
  • usually require an activator to be transcribed.
  • usually require a repressor to be transcribed.

Questão 67

Questão
Which of the following are considered to be frameshift mutations?
Responda
  • insertions
  • inversions
  • deletions
  • both inversion and insertion
  • both deletions and insertions

Questão 68

Questão
If the codon AAA is changed to AAG, it still codes for the amino acid lysine; this is an example of a
Responda
  • silent mutation
  • nonsense mutation
  • frameshift mutation
  • gross mutation
  • missense mutation

Questão 69

Questão
Which of the following causes mutations by creating thymine dimers?
Responda
  • nucleotide analogs
  • nitrous acid
  • ultraviolet light
  • benzopyrene
  • gamma rays

Questão 70

Questão
DNA damage caused by ethidium bromide results in __________ mutations.
Responda
  • insertion
  • substitution
  • deletion
  • both inversion and insertion
  • both insertion and deletion

Questão 71

Questão
Which of the following is a DNA repair enzyme activated by visible light?
Responda
  • transposase
  • DNA photolyase
  • bacteriocin
  • DNA ligase
  • primase

Questão 72

Questão
The Ames test proves that a chemical is
Responda
  • carcinogenic
  • carcinogenic in Salmonella
  • mutagenic in Salmonella
  • carcinogenic in humans
  • mutagenic in humans

Questão 73

Questão
The horizontal transfer process known as transduction
Responda
  • involves a virus
  • involves a pilus
  • requires a cell to be "competent"
  • requires a plasmid
  • involves a mutagen

Questão 74

Questão
Frederick Griffith discovered
Responda
  • transformation
  • transposons
  • the lac operon
  • DNA
  • conjugation

Questão 75

Questão
In conjugation, F+ cells
Responda
  • serve as recipient cells
  • contain an F plasmid
  • do not have conjugation pili
  • can transfer DNA only to other F+ cells
  • contain "jumping genes"

Questão 76

Questão
Another term for the palindromic sequence found at the ends of transposons is a(n)
Responda
  • complex
  • bacteriophage
  • insertion sequence
  • inverted repeat
  • transposase

Questão 77

Questão
Which of the following is characteristic of prokaryotic genomes but NOT eukaryotic genomes?
Responda
  • histones
  • circular chromosomes
  • linear chromosomes
  • enclosed in nuclear membrane
  • typically consist of a few to several chromosomes

Questão 78

Questão
Genes are active in a region of the eukaryotic chromosome called
Responda
  • heterochromatin
  • the histone
  • the nucleoid
  • the plasmid
  • euchromatin

Questão 79

Questão
The energy required for DNA replication comes from
Responda
  • DNA polymerase
  • triphosphate deoxyribonucleotides
  • DNA ligase
  • RNA primer
  • the leading strand

Questão 80

Questão
Which of the following is NOT involved in the regulation of the lac operon?
Responda
  • an inducer
  • a repressor protein
  • an iRNA
  • glucose
  • cyclic AMP

Questão 81

Questão
Genetic elements known as promoters are initiation points in the process of
Responda
  • DNA replication
  • transcription
  • translation
  • mutation repair
  • transformation

Questão 82

Questão
Codons are recognized during
Responda
  • translation
  • transcription
  • base excision
  • DNA replication
  • transduction

Questão 83

Questão
__________ is initiated at sequences called origins
Responda
  • DNA replication
  • translation
  • splicing
  • transcription
  • transposition

Questão 84

Questão
The process of __________ requires the activity of DNA ligase.
Responda
  • translation
  • capping
  • transcription
  • DNA replication
  • transduction

Questão 85

Questão
RNA polymerase is primarily responsible for
Responda
  • DNA replication
  • translation
  • transcription
  • transformation
  • polyadenylation

Questão 86

Questão
The process of __________ requires participation of tRNA molecules
Responda
  • DNA replication
  • capping
  • transduction
  • translation
  • dark repair

Questão 87

Questão
The process of __________ is initiated with the incorporation of fMet.
Responda
  • translation
  • transcription
  • capping
  • DNA replication
  • light repair

Questão 88

Questão
Initiation of __________ involves Sigma factor molecules.
Responda
  • DNA replication
  • translation
  • transcription
  • splicing
  • termination

Questão 89

Questão
The process of __________ is described as semiconservative.
Responda
  • translation
  • transcription
  • mismatch repair
  • transformation
  • DNA replication

Questão 90

Questão
During __________, the growing polymer is located in the P site.
Responda
  • polyadenylation
  • DNA replication
  • mismatch repair
  • transcription
  • translation

Questão 91

Questão
Standard methods of sterilization are not effective in inactivating
Responda
  • viruses
  • bacterial cells
  • prions
  • bacterial endospores
  • fungi

Questão 92

Questão
Which of the following statements is true of disinfectants?
Responda
  • Disinfectants are effective in destroying endospores.
  • Disinfectants are used on living tissue.
  • Disinfectants are used for sterilization
  • Disinfectants are used on inanimate surfaces.
  • Disinfectants are only effective for short periods of time (seconds to minutes).

Questão 93

Questão
Which of the following statements concerning microbial death is FALSE?
Responda
  • It can be used to evaluate the efficacy of antimicrobial agents.
  • It is constant over time of exposure to an antimicrobial agent.
  • It is the permanent loss of a microbe's reproductive ability.
  • It is the permanent loss of a microbe's ability to reproduce and can be used to evaluate antimicrobial agents
  • It is not an effective means of evaluating the efficacy of antimicrobial agents.

Questão 94

Questão
Which of the following is an example of sanitization?
Responda
  • A public toilet is treated with disinfectants.
  • A surgeon washes her hands before surgery
  • Heat is used to kill potential pathogens in apple juice.
  • An autoclave is used to prepare nutrient agar.
  • A nurse prepares an injection site with an alcohol swab.

Questão 95

Questão
Aseptic means
Responda
  • sterile
  • free of all microbes
  • clean
  • sanitized
  • free of pathogens

Questão 96

Questão
Which of the following would NOT be bacteriostatic?
Responda
  • desiccation
  • freezing below 0 degrees Celsius
  • lyophilization
  • autoclaving
  • refrigeration of mesophiles

Questão 97

Questão
Antimicrobial agents that damage nucleic acids also affect
Responda
  • the cell wall
  • the cell membrane
  • the viral envelope
  • endospores
  • protein synthesis

Questão 98

Questão
Seventy percent alcohol is effective against
Responda
  • enveloped viruses
  • noneveloped viruses
  • bacterial endospores
  • protozoan cysts
  • prions

Questão 99

Questão
An instrument that will come into contact with only the skin of a patient should be disinfected with a(n)
Responda
  • high-level germicide
  • low-level germicide.
  • intermediate-level germicide.
  • degerming agent only.
  • germistatic agent only.

Questão 100

Questão
Which of the following is NOT an effective means of sterilization?
Responda
  • ionizing radiation
  • incineration
  • lyophilization
  • autoclaving
  • dry heat

Questão 101

Questão
Which of the following describes flash pasteurization?
Responda
  • heating at 63°C for 30 minutes
  • heating at 72°C for 15 seconds
  • heating at 72°C for 15 minutes
  • heating at 134°C for one second
  • passing liquid through steam at 140°C

Questão 102

Questão
The dairy creamer used in restaurants is usually sterilized by
Responda
  • filtration
  • ionizing radiation
  • lyophilization
  • UHT sterilization
  • autoclaving

Questão 103

Questão
Boiling water for 10 minutes is effective in ridding it of
Responda
  • actively growing bacteria
  • enveloped viruses
  • bacterial endospores
  • protozoan cysts
  • both growing bacteria and enveloped viruses

Questão 104

Questão
Which of the following is NOT a feature associated with filtration?
Responda
  • nitrocellulose or plastic membrane filters
  • sterilization of heat-sensitive materials
  • varying thicknesses of membrane filters used
  • use of HEPA filters to filter air
  • ability of some filters to trap viruses and proteins

Questão 105

Questão
Which of the following is a target of pasteurization?
Responda
  • Bacillus stearothermophilus
  • Clostridium botulinum
  • Neisseria gonorrhoeae
  • Chlamydia trachomatis
  • Brucella melitensis

Questão 106

Questão
Which of the following types of radiation is nonionizing and has the shortest wavelength?
Responda
  • ultraviolet light
  • infrared radiation
  • microwaves
  • X rays
  • gamma rays

Questão 107

Questão
Which of the following is used for microbial control in fresh fruits and vegetables?
Responda
  • X rays
  • ultraviolet
  • electron beams
  • microwaves
  • gamma rays

Questão 108

Questão
Which of the following can be used to disinfect air?
Responda
  • HEPA filters
  • ethylene oxide
  • ultraviolet light
  • both HEPA and ultraviolet light
  • both ethylene oxide and ultraviolet light

Questão 109

Questão
Lysol is an example of which of the following groups of chemical antimicrobial agents?
Responda
  • halogens
  • phenolics
  • alcohols
  • aldehydes
  • surfactants

Questão 110

Questão
Which of the following is the most appropriate pairing of microbe and biosafety level?
Responda
  • E. coli, BSL-3
  • anthrax, BSL-1
  • Ebola, BSL-2
  • methicillin-resistant Staphylococcus aureus (MRSA), BSL-2
  • tuberculosis, BSL-1

Questão 111

Questão
Betadine is an example of which of the following groups of antimicrobial agents?
Responda
  • alcohols
  • heavy metals
  • halogens
  • phenolics
  • surfactants

Questão 112

Questão
Which of the following statements about quaternary ammonium compounds is FALSE?
Responda
  • They are a type of detergent.
  • Zephiran is an example of a quat.
  • They are not effective against Pseudomonas aeruginosa.
  • They function by cross-linking proteins.
  • They are harmless to humans except at high concentrations.

Questão 113

Questão
Which of the following is a sterilizing agent?
Responda
  • ozone
  • hydrogen peroxide
  • peracetic acid
  • dish soap
  • ozone and hydrogen peroxide

Questão 114

Questão
Which of the following was used in the past to prevent the transmission of gonorrhea from an infected mother to her newborn?
Responda
  • hydrogen peroxide
  • beta-propiolactone
  • thimerosal
  • hexachlorophene
  • silver nitrate

Questão 115

Questão
Which of the following is used to sterilize items that should not, or cannot, be exposed to heat or water?
Responda
  • ethylene oxide
  • formaldehyde
  • hydrogen peroxide
  • calcium hypochlorite
  • triclosan

Questão 116

Questão
Which of the following statements about aldehydes is FALSE?
Responda
  • They are used only to preserve dead tissues.
  • They denature proteins.
  • Some aldehydes can sterilize after long periods of exposure.
  • They are usually hazardous to humans.
  • They are used in aqueous solutions.

Questão 117

Questão
Disinfecting agents naturally produced by microorganisms are
Responda
  • aldehydes
  • antimicrobials.
  • halogens
  • quats
  • triclosans

Questão 118

Questão
A chemical agent that kills pathogenic microbes in general is a(n)
Responda
  • sanitizer
  • germicide
  • disinfectant
  • fungicide
  • antiseptic

Questão 119

Questão
Which of the following is NOT a desirable characteristic of an ideal antimicrobial agent?
Responda
  • It is inexpensive
  • It is stable during storage
  • It is harmless to humans
  • It only arrests grows of vegetative cells.
  • It acts quickly

Questão 120

Questão
The endospores of which of the following microbes are used to measure the effectiveness of autoclave sterilization?
Responda
  • Clostridium botulinum
  • Neisseria gonorrhoeae
  • Bacillus stearothermophilus
  • Pseudomonas aeruginosa
  • Mycobacterium bovis

Questão 121

Questão
A scientist develops a new medication that is a protein compound and that must be administered by injection. Which of the following would be the most effective and safest means of preparing a sterile solution of the new medication?
Responda
  • autoclaving
  • filtration
  • dilution with alcohol
  • lyophilization
  • ultraviolet irradiation

Questão 122

Questão
Which of the following procedures is currently the standard test used in the United States for evaluating the efficiency of antiseptics and disinfectants?
Responda
  • use-dilution test
  • microbial death rate
  • in-use test
  • thermal death point
  • phenol coefficient

Questão 123

Questão
Which of the following would be used to sterilize a mattress?
Responda
  • autoclaving
  • formaldehyde
  • ethylene oxide
  • heavy metals
  • radiation

Questão 124

Questão
Disinfectants that damage membranes include
Responda
  • alcohol
  • phenolics
  • iodine
  • hydrogen peroxide
  • both alcohol and phenolics

Questão 125

Questão
Which of the following antimicrobial agents is the most toxic to humans?
Responda
  • 70 % alcohol
  • ethylene oxide
  • quats
  • chloramines
  • iodophors

Questão 126

Questão
The process of filtration is a(n)
Responda
  • disinfectant method.
  • sterilizing method.
  • sanitization method.
  • antiseptic procedure.
  • ineffective method for removing microbes.

Questão 127

Questão
Hydrogen peroxide is a(n)
Responda
  • sterilizing agent.
  • disinfecting agent.
  • antiseptic.
  • disinfecting and sterilizing agent.
  • ineffective method of disinfecting.

Questão 128

Questão
The process of incineration is used for
Responda
  • sterilization
  • disinfection
  • sanitization
  • both disinfection and sanitization
  • degerming

Questão 129

Questão
Alcohols are used for
Responda
  • disinfection.
  • sterilization.
  • antisepsis.
  • both sterilization and disinfection.
  • both antisepsis and disinfection.

Questão 130

Questão
The chemical agents known as "quats" are used for
Responda
  • antisepsis
  • disinfection
  • sterilization
  • quantifying antimicrobial activity
  • neither antisepsis nor disinfection

Questão 131

Questão
The compound ethylene oxide is used in
Responda
  • sanitization.
  • sterilization.
  • antisepsis.
  • degerming.
  • disinfection.

Questão 132

Questão
Glutaraldehyde is used for
Responda
  • antisepsis.
  • disinfection.
  • sterilization
  • sanitization.
  • both disinfection and sterilization.

Questão 133

Questão
__________ may be achieved using chlorine dioxide.
Responda
  • Disinfection
  • Sterilization
  • Degerming
  • Antisepsis
  • Both antisepsis and degerming

Questão 134

Questão
Gamma irradiation is a process for
Responda
  • sterilization.
  • disinfection.
  • antisepsis.
  • degerming.
  • both antisepsis and disinfection.

Questão 135

Questão
__________ can be accomplished using boiling water.
Responda
  • Sanitization
  • Disinfection
  • Sterilization
  • Antisepsis
  • Both disinfection and sanitization

Questão 136

Questão
Obligate anaerobes have enzymes such as superoxide dismutase to protect them from the damaging effects of oxygen.
Responda
  • True
  • False

Questão 137

Questão
Nitrogen fixation is a process that occurs in all bacteria.
Responda
  • True
  • False

Questão 138

Questão
Thermoduric mesophiles are often responsible for spoilage of improperly canned foods.
Responda
  • True
  • False

Questão 139

Questão
An obligate halophile will burst if placed in freshwater.
Responda
  • True
  • False

Questão 140

Questão
The only effective way to store bacterial cultures for short periods of time is to arrest their metabolism by freezing.
Responda
  • True
  • False

Questão 141

Questão
Quorum sensing is a process by which bacteria respond to the density of other bacteria in their environment.
Responda
  • True
  • False

Questão 142

Questão
An obligate anaerobe can be cultured in a candle jar.
Responda
  • True
  • False

Questão 143

Questão
Agar is a useful compound in the microbiology lab because it is an excellent nutrient for bacteria.
Responda
  • True
  • False

Questão 144

Questão
A selective medium can be formulated either by including inhibitory chemical substances or by leaving out a single crucial nutrient.
Responda
  • True
  • False

Questão 145

Questão
In spectrophotometry, 40% light transmission is the same thing as 60% absorbance of light.
Responda
  • True
  • False

Questão 146

Questão
Prokaryotic cells are diploid.
Responda
  • True
  • False

Questão 147

Questão
Prokaryotes have one type of DNA polymerase, which is different from that of eukaryotes.
Responda
  • True
  • False

Questão 148

Questão
The most common type of mutation is a point mutation.
Responda
  • True
  • False

Questão 149

Questão
Most bacteria have a natural ability to take up DNA from their environment.
Responda
  • True
  • False

Questão 150

Questão
The structure of DNA explains both its ability to encode genetic information and the way in which it is copied during cell reproduction.
Responda
  • True
  • False

Questão 151

Questão
DNA, which is negatively charged, wraps around positively charged histones as part of the packaging of eukaryotic chromosomes.
Responda
  • True
  • False

Questão 152

Questão
Bidirectional replication means that each strand of a DNA molecule is replicated in the opposite direction from the other.
Responda
  • True
  • False

Questão 153

Questão
The phenotype of an organism reflects only part of its genotype.
Responda
  • True
  • False

Questão 154

Questão
In generalized transduction, viruses carry random DNA sequences from one cell to another.
Responda
  • True
  • False

Questão 155

Questão
DNA polymerase III participates in the dark repair mechanism of DNA mutation repair.
Responda
  • True
  • False

Questão 156

Questão
An environment may contain some microbes and still be considered sterile.
Responda
  • True
  • False

Questão 157

Questão
Some viruses are inactivated by the same chemical or physical agents that damage cytoplasmic membranes.
Responda
  • True
  • False

Questão 158

Questão
UV light has the most effect on protein structure.
Responda
  • True
  • False

Questão 159

Questão
Antimicrobial agents usually work best at high temperatures and pH levels.
Responda
  • True
  • False

Questão 160

Questão
The phenol coefficient is one of the most widely used measurements of an antimicrobial agent's effectiveness.
Responda
  • True
  • False

Questão 161

Questão
No chemical or antimicrobial agents inactivate prions.
Responda
  • True
  • False

Questão 162

Questão
The decimal reduction time is the time required to kill all the microbes in a given sample.
Responda
  • True
  • False

Questão 163

Questão
Slow freezing is more damaging to microbial cells than quick freezing.
Responda
  • True
  • False

Questão 164

Questão
Hydrogen peroxide is an effective antiseptic.
Responda
  • True
  • False

Questão 165

Questão
By themselves, soaps have only degerming activity, not antimicrobial activity.
Responda
  • True
  • False

Quer criar seus próprios Quizzes gratuitos com a GoConqr? Saiba mais.

Semelhante

Phrasal Verbs
Alessandra S.
Noções de organização administrativa- - centralização, descentralização, concentração e desconcentração - adm direta e indireta - autarquias , fundações, empresas publicas, sem
michelegraca
NOÇÕES DE INFORMÁTICA
Viviana Veloso
English General Quiz
Luiz Fernando
Vestibular - Crase
GoConqr suporte .
Projeto Med 2015: História e Geografia_2
Gleisson Bissoli
Ética para OAB
Maria José
Ligações Químicas
Marcos do Help
10 dicas para você lidar melhor com o seu tempo
vivi sousa
Metonímia
Diogo Alcantara
Reino Fungi
Taína Garcia Moreno Tomazella
Explore a Biblioteca