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Quiz on Microorganisms MCQ's 2009, created by tj.sloan on 16/02/2015.

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Microorganisms MCQ's 2009

Question 1 of 25

1

All organisms require the following macronutrients:

Select one of the following:

  • Potassium, magnesium, zinc

  • Phosphorus, cobalt, manganese

  • Calcium, potassium, zinc

  • Phosphorus, potassium, magnesium

Explanation

Question 2 of 25

1

Which of the following forms of oxygen are generally toxic to living organisms?

Select one of the following:

  • Superoxide anion

  • Hydrogen peroxide

  • Hydroxyl radical

  • All of the above

Explanation

Question 3 of 25

1

Carrier mediated transport is necessary when:

Select one of the following:

  • 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

Explanation

Question 4 of 25

1

The size (as determined by the sedimentation factor) of the most useful RNA molecule for prokaryotic evolutionary studies is:

Select one of the following:

  • 5S

  • 16S

  • 18S

  • 23S

Explanation

Question 5 of 25

1

Which of these environmental factors influence microbial growth?

Select one of the following:

  • pH

  • Water potential

  • Oxygen

  • All of the above

Explanation

Question 6 of 25

1

The signature sequence is used extensively in the:

Select one of the following:

  • Cultivation of microorganisms

  • Reclassification of misclassified organisms

  • Defining of a specific group within a domain

  • All of the above

Explanation

Question 7 of 25

1

Which one of the following sentences correctly describes the science of Metagenomics?

Select one of the following:

  • 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

Explanation

Question 8 of 25

1

With regards to bacterial plasmids which statement is the correct one?

Select one of the following:

  • 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

Explanation

Question 9 of 25

1

Virus particles:

Select one of the following:

  • 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

Explanation

Question 10 of 25

1

Tobacco mosaic virus:

Select one of the following:

  • 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

Explanation

Question 11 of 25

1

The symptom ‘hyperpalsia’ in plants caused by a fungal infection is due to:

Select one of the following:

  • Abnormal cell enlargement

  • Downward growth of petioles

  • Uncontrolled cell division

  • Restriction of water transport

Explanation

Question 12 of 25

1

Asexual reproduction in the Mastigomycotina (e.g. Phytophthora spp.) results in the formation of:

Select one of the following:

  • Sporangia

  • Oospores

  • Zygospores

  • Conidia

Explanation

Question 13 of 25

1

Which one of the following diseases is NOT caused by an infectious agent?

Select one of the following:

  • Stomach ulcer

  • Cystic fibrosis

  • Cervical cancer

  • Liver cancer

Explanation

Question 14 of 25

1

Which of the following is a bacterial infection?

Select one of the following:

  • Whooping cough

  • Polio

  • Acquired immunodeficiency syndrome

  • Malaria

Explanation

Question 15 of 25

1

Pasteur is attributed with which one of the following discoveries?

Select one of the following:

  • 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

Explanation

Question 16 of 25

1

The length of a typical E. coli cell is approximately?

Select one of the following:

  • 20 μm

  • 2 μm

  • 200 nm

  • 20 nm

Explanation

Question 17 of 25

1

With respect to differences between members of the archaeal and bacterial domains/kingdoms, which is the CORRECT statement?

Select one of the following:

  • 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

Explanation

Question 18 of 25

1

Which statement is correct with respect to the E.coli chromosome?

Select one of the following:

  • It is negatively supercoiled

  • It is positively supercoiled

  • There are typically several origins of replication

  • It consists of over 50 million base pairs

Explanation

Question 19 of 25

1

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?

Select one of the following:

  • 6.3 x 10(7)

  • 6.3 x 10(8)

  • 6.3 x 10(6)

  • 6.3 x 10(5)

Explanation

Question 20 of 25

1

Bacterial flagella bring about cell motion by which mechanism?

Select one of the following:

  • 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

Explanation

Question 21 of 25

1

Systems biology approaches to the study of fungal cells do NOT necessarily involve:

Select one of the following:

  • 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

Explanation

Question 22 of 25

1

Which of these statements is UNTRUE?

Select one of the following:

  • 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

Explanation

Question 23 of 25

1

An extremophilic microbe is one which:

Select one of the following:

  • 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

Explanation

Question 24 of 25

1

Fungal growth and cell division is NOT normally accompanied by:

Select one of the following:

  • Biomass acquisition

  • Reduced vitality

  • Nucleic acid replication

  • Enhanced ability to compete with other microbial species

Explanation

Question 25 of 25

1

One factor that is NOT used to prevent or reduce fungal spoilage of processed foods is:

Select one of the following:

  • Addition of benzene

  • Low water-activity

  • Refrigeration

  • Heat-sterilization

Explanation

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