Quiz
Microorganisms MCQ's 2010
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Fragen in diesem Quiz (25)
1A microbe growing in a functioning refrigerator is probably a:
- APsychrophile
- BMesophile
- CThermophile
- DHyperthermophile
2Active transport in necessary when:
- ADiffusion will not allow adequate amounts of a substance to enter the cell
- BMovement into the cell is against a concentration gradient
- CThe level of nutrients in nature is very low
- DAll of the above
3The size of the most useful RNA molecule for prokaryotic evolutionary studies is:
- A5S
- B16S
- C18S
- D23S
4Siderophores:
- AAct as a solvent for iron and transport it into the cells
- BAre a key component of cytochromes
- CHelp maintain osmotic balance in seawater microbes
- DDevelop when errors in membrane synthesis occur
5Chemical energy is released when organic or inorganic compounds are:
- AReduced
- BIncorporated into larger molecules
- CSynthesized
- DOxidized
6MacConkey agar selects for:
- AGram-negative bacteria
- BGram-positive bacteria
- CBoth Gram-positive and Gram-negative bacteria
- DHaemolytic microorganisms
7The bacterial genome is:
- AMostly diploid but includes several haploid regions
- BA single circular DNA molecule
- CMostly haploid
- DA double stranded RNA molecule
8With regards to bacterial plasmids which statement is the correct one?
- APlasmids are extra chromosomal DNA that encode only resistance to antibiotics
- BPlasmids are a part of bacterial chromosome
- CPlasmids are single stranded DNA found in some bacteria
- DPlasmids are extra chromosomal DNA molecules
9The genomes of positive-sense RNA viruses:
- ACan give rise to infectious virus if transfected into their host tissue culture cells
- BAre fully or partially translated immediately following uncoating in host cells
- CNeed to be transcribed to produce mRNA molecules immediately after uncoating
- DAlways carry a polymerase molecule in their mature capsid that functions after infection
10The poliovirus mature virus particle:
- AContains 240 copies of a single protein
- BContains 60 copies of four proteins
- CHas a dsDNA genome
- DHas a single stranded negative–sense genome
11Which of the following organisms is NOT a true fungus (i.e. it is classified in the Kingdom Protoctista):
- APhytophthora infestans
- BBotrytis cinerea
- CAgaricus bisporus
- DTaphrina deformans
12Black sigatoka is a:
- AFungal root disease of bananas
- BFungal foliar disease of bananas
- CFungal fruit disease of apples
- DFungal foliar disease of potatoes
13Which of the following is transmitted to humans by arthropods?
- ATuberculosis
- BMalaria
- CCholera
- DTyphoid
14Which of the following is a host component important in specific immune recognition of extracellular microbes?
- AAntigen
- BAntibody
- CPhagocyte
- DLipopolysaccharide
15With regard to the differences between bacterial and eukaryotic cells which statement is the correct one?
- ABacterial cells do not contain mitochondria
- BBacterial cells are usually larger than eukaryote cells
- CBacteria do not contain a chromosome
- DBacterial cells are not sensitive to β-lactam antibiotics
16Koch’s postulates most correctly relate to which one of the following statements?
- AThe isolation of a bacterium in culture from a human alone indicates that it causes disease
- BDetermination in a series logical steps the agent that causes disease
- CThe observation of bacterial cells in tissue from a human with disease indicates that the observed bacterium has caused the disease
- DInoculation of a bacterium into an animal to cause disease alone indicates that it is the cause of the disease observed
17Which statement is correct with respect to Lipopolysaccharide (LPS)?
- ALPS is found in Gram positive cells
- BLPS is found in Gram negative cells in the cytoplasmic membrane
- CLPS is found in the outer-membrane of Gram negative cells
- DLPS is associated with all bacterial cells
18A 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?
- A6.3 x 10(7)
- B6.3 x 10(8)
- C6.3 x 10(6)
- D6.3 x 10(5)
19With respect to differences between members of the archaeal and bacterial domains/kingdoms, which is the correct statement?
- ABoth have peptidoglycan in their cell walls
- BOnly some Archaea are capable of methanogenesis
- CArchaea are sensitive to β-lactam antibiotics
- DBacteria have similar RNA polymerase to that of Archaea
20Which statement is correct with respect to peptidoglycan?
- AThere are multiple molecules of peptidoglycan in bacterial cell walls
- BOnly Gram positive cells possess peptidoglycan
- CThere is only a single molecule of peptidoglycan in a bacterial cell wall
- DPeptidoglycan is only found in Gram negative cell walls
21Fungi primarily contribute to soil and plant health by:
- ADegrading sand particles to release Si
- BFacilitating desiccation of water-logged soils
- CDegrading organic matter and releasing nutrients
- DPreventing bacterial growth
22Fungi tend to live at interfaces. Which of these statements is untrue:
- AThis can be where nutrients are most concentrated
- BSolid surfaces may provide anchorage
- COther microbes, that leak useful metabolites, may inhabit such niches
- DThere is typically less water on physical surfaces and fungi avoid water
23Fungal growth and cell division is not normally accompanied by:
- ABiomass aquisition
- BReduced vitality
- CNucleic acid replication
- DEnhanced ability to compete with other microbial species
24One factor that is not used to prevent or reduce fungal spoilage of processed foods is:
- AAddition of benzene
- BLow water-activity
- CRefrigeration
- DHeat-sterilization
25Saprophytic activity is essential for biosphere health because it:
- AFacilitates nutrient cycling and waste degradation
- BKills host organisms and thereby averts overpopulation
- CFacilitates species evolution via endosymbiosis
- DInvolves mineralization of inorganic rocks in the lithosphere
Informationen
- Beschreibung
- Papers covered; May 2010
- Autor
- tj.sloan
- Sprache
- English
- Aufrufe
- 60
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