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Microorganisms MCQ's 2009

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Quiz on Microorganisms MCQ's 2009, created by tj.sloan on 16/02/2015.
tj.sloan
Quiz by tj.sloan, updated more than 1 year ago
tj.sloan
Created by tj.sloan about 9 years ago
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Question 1

Question
All organisms require the following macronutrients:
Answer
  • Potassium, magnesium, zinc
  • Phosphorus, cobalt, manganese
  • Calcium, potassium, zinc
  • Phosphorus, potassium, magnesium

Question 2

Question
Which of the following forms of oxygen are generally toxic to living organisms?
Answer
  • Superoxide anion
  • Hydrogen peroxide
  • Hydroxyl radical
  • All of the above

Question 3

Question
Carrier mediated transport is necessary when:
Answer
  • Diffusion will not allow adequate amounts of a substance to enter the cell
  • Movement into the cell is against a concentration gradient
  • The level of nutrients in nature is very low
  • All of the above

Question 4

Question
The size (as determined by the sedimentation factor) of the most useful RNA molecule for prokaryotic evolutionary studies is:
Answer
  • 5S
  • 16S
  • 18S
  • 23S

Question 5

Question
Which of these environmental factors influence microbial growth?
Answer
  • pH
  • Water potential
  • Oxygen
  • All of the above

Question 6

Question
The signature sequence is used extensively in the:
Answer
  • Cultivation of microorganisms
  • Reclassification of misclassified organisms
  • Defining of a specific group within a domain
  • All of the above

Question 7

Question
Which one of the following sentences correctly describes the science of Metagenomics?
Answer
  • Metagenomics is a genome level study of the whole microbial community
  • Metagenomics is a genomics of industrially and medically important bacteria
  • Metagenomics is a study of gene expression
  • Metagenomics is a comparative analysis of the sequenced microbial genomes

Question 8

Question
With regards to bacterial plasmids which statement is the correct one?
Answer
  • A plasmid is a regulatory gene
  • A plasmid is a short RNA molecule
  • A plasmid is an extra chromosomal DNA molecule
  • A plasmid is a non coding region found in some bacterial genomes

Question 9

Question
Virus particles:
Answer
  • Are always smaller than bacterial cells
  • Can replicate independently of a host cell if provided with a nutrient medium
  • Can use some of the enzymes expressed in the host cell to aid their replication
  • Are always eliminated by the host immune system

Question 10

Question
Tobacco mosaic virus:
Answer
  • Has an icosahedral capsid
  • Has a helical capsid
  • Has multiple copies of each of four proteins making up the capsid
  • Has multiple copies of two proteins making up the capsid

Question 11

Question
The symptom ‘hyperpalsia’ in plants caused by a fungal infection is due to:
Answer
  • Abnormal cell enlargement
  • Downward growth of petioles
  • Uncontrolled cell division
  • Restriction of water transport

Question 12

Question
Asexual reproduction in the Mastigomycotina (e.g. Phytophthora spp.) results in the formation of:
Answer
  • Sporangia
  • Oospores
  • Zygospores
  • Conidia

Question 13

Question
Which one of the following diseases is NOT caused by an infectious agent?
Answer
  • Stomach ulcer
  • Cystic fibrosis
  • Cervical cancer
  • Liver cancer

Question 14

Question
Which of the following is a bacterial infection?
Answer
  • Whooping cough
  • Polio
  • Acquired immunodeficiency syndrome
  • Malaria

Question 15

Question
Pasteur is attributed with which one of the following discoveries?
Answer
  • Was the first to see microorganisms under a microscope
  • First to discover and use agar
  • That there could be life without air
  • The first chemical antibiotics

Question 16

Question
The length of a typical E. coli cell is approximately?
Answer
  • 20 μm
  • 2 μm
  • 200 nm
  • 20 nm

Question 17

Question
With respect to differences between members of the archaeal and bacterial domains/kingdoms, which is the CORRECT statement?
Answer
  • Both have peptidoglycan in their cell walls
  • Only some Archaea are capable of methanogenesis
  • Archaea are sensitive to β-lactam antibiotics
  • Bacteria have similar RNA polymerase to that of Archaea

Question 18

Question
Which statement is correct with respect to the E.coli chromosome?
Answer
  • It is negatively supercoiled
  • It is positively supercoiled
  • There are typically several origins of replication
  • It consists of over 50 million base pairs

Question 19

Question
A culture of E. coli is diluted by a factor of 10-6 and, after plating out 100 μl on an agar plate, 63 colonies grew after incubation at 37oC overnight. The original culture therefore contained how many viable E coli cells per ml?
Answer
  • 6.3 x 10(7)
  • 6.3 x 10(8)
  • 6.3 x 10(6)
  • 6.3 x 10(5)

Question 20

Question
Bacterial flagella bring about cell motion by which mechanism?
Answer
  • Wave-like movement of the flagellum
  • Rotation of the cell
  • Rotation of the flagellum in one direction only
  • Rotation of the flagellum that is reversible

Question 21

Question
Systems biology approaches to the study of fungal cells do NOT necessarily involve:
Answer
  • Generation of data from biological experiments
  • Mathematical quantification of changes in cell components
  • Creation of a model of the cellular system in silico
  • Creation of a conceptual model based on philosophical techniques

Question 22

Question
Which of these statements is UNTRUE?
Answer
  • Some species of yeast are highly tolerant to ethanol stress
  • Some species of fungi are extremely xerophilic
  • Many fungi are more tolerant to water stress than any bacterial species
  • Fungi can grow over the entire pH range from 0 to 14

Question 23

Question
An extremophilic microbe is one which:
Answer
  • Can survive dry conditions
  • Can grow only when there is a mixture of stress parameters (e.g. high temperatures and low pH)
  • Can grow optimally under extreme conditions
  • Becomes dormant under extreme conditions

Question 24

Question
Fungal growth and cell division is NOT normally accompanied by:
Answer
  • Biomass acquisition
  • Reduced vitality
  • Nucleic acid replication
  • Enhanced ability to compete with other microbial species

Question 25

Question
One factor that is NOT used to prevent or reduce fungal spoilage of processed foods is:
Answer
  • Addition of benzene
  • Low water-activity
  • Refrigeration
  • Heat-sterilization
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