Test
Microorganisms MCQ's 2009
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Preguntas del test (25)
1All organisms require the following macronutrients:
- APotassium, magnesium, zinc
- BPhosphorus, cobalt, manganese
- CCalcium, potassium, zinc
- DPhosphorus, potassium, magnesium
2Which of the following forms of oxygen are generally toxic to living organisms?
- ASuperoxide anion
- BHydrogen peroxide
- CHydroxyl radical
- DAll of the above
3Carrier mediated transport is 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
4The size (as determined by the sedimentation factor) of the most useful RNA molecule for prokaryotic evolutionary studies is:
- A5S
- B16S
- C18S
- D23S
5Which of these environmental factors influence microbial growth?
- ApH
- BWater potential
- COxygen
- DAll of the above
6The signature sequence is used extensively in the:
- ACultivation of microorganisms
- BReclassification of misclassified organisms
- CDefining of a specific group within a domain
- DAll of the above
7Which one of the following sentences correctly describes the science of Metagenomics?
- AMetagenomics is a genome level study of the whole microbial community
- BMetagenomics is a genomics of industrially and medically important bacteria
- CMetagenomics is a study of gene expression
- DMetagenomics is a comparative analysis of the sequenced microbial genomes
8With regards to bacterial plasmids which statement is the correct one?
- AA plasmid is a regulatory gene
- BA plasmid is a short RNA molecule
- CA plasmid is an extra chromosomal DNA molecule
- DA plasmid is a non coding region found in some bacterial genomes
9Virus particles:
- AAre always smaller than bacterial cells
- BCan replicate independently of a host cell if provided with a nutrient medium
- CCan use some of the enzymes expressed in the host cell to aid their replication
- DAre always eliminated by the host immune system
10Tobacco mosaic virus:
- AHas an icosahedral capsid
- BHas a helical capsid
- CHas multiple copies of each of four proteins making up the capsid
- DHas multiple copies of two proteins making up the capsid
11The symptom ‘hyperpalsia’ in plants caused by a fungal infection is due to:
- AAbnormal cell enlargement
- BDownward growth of petioles
- CUncontrolled cell division
- DRestriction of water transport
12Asexual reproduction in the Mastigomycotina (e.g. Phytophthora spp.) results in the formation of:
- ASporangia
- BOospores
- CZygospores
- DConidia
13Which one of the following diseases is NOT caused by an infectious agent?
- AStomach ulcer
- BCystic fibrosis
- CCervical cancer
- DLiver cancer
14Which of the following is a bacterial infection?
- AWhooping cough
- BPolio
- CAcquired immunodeficiency syndrome
- DMalaria
15Pasteur is attributed with which one of the following discoveries?
- AWas the first to see microorganisms under a microscope
- BFirst to discover and use agar
- CThat there could be life without air
- DThe first chemical antibiotics
16The length of a typical E. coli cell is approximately?
- A20 μm
- B2 μm
- C200 nm
- D20 nm
17With 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
18Which statement is correct with respect to the E.coli chromosome?
- AIt is negatively supercoiled
- BIt is positively supercoiled
- CThere are typically several origins of replication
- DIt consists of over 50 million base pairs
19A 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)
20Bacterial flagella bring about cell motion by which mechanism?
- AWave-like movement of the flagellum
- BRotation of the cell
- CRotation of the flagellum in one direction only
- DRotation of the flagellum that is reversible
21Systems biology approaches to the study of fungal cells do NOT necessarily involve:
- AGeneration of data from biological experiments
- BMathematical quantification of changes in cell components
- CCreation of a model of the cellular system in silico
- DCreation of a conceptual model based on philosophical techniques
22Which of these statements is UNTRUE?
- ASome species of yeast are highly tolerant to ethanol stress
- BSome species of fungi are extremely xerophilic
- CMany fungi are more tolerant to water stress than any bacterial species
- DFungi can grow over the entire pH range from 0 to 14
23An extremophilic microbe is one which:
- ACan survive dry conditions
- BCan grow only when there is a mixture of stress parameters (e.g. high temperatures and low pH)
- CCan grow optimally under extreme conditions
- DBecomes dormant under extreme conditions
24Fungal growth and cell division is NOT normally accompanied by:
- ABiomass acquisition
- BReduced vitality
- CNucleic acid replication
- DEnhanced ability to compete with other microbial species
25One factor that is NOT used to prevent or reduce fungal spoilage of processed foods is:
- AAddition of benzene
- BLow water-activity
- CRefrigeration
- DHeat-sterilization
Información
- Descripción
- Test sobre Microorganisms MCQ's 2009, creado por tj.sloan el 16/02/2015.
- Autor
- tj.sloan
- Idioma
- English
- Visitas
- 63
- Valoración
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