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Papers covered; May 2010

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Microorganisms MCQ's 2010

Frage 1 von 25

1

A microbe growing in a functioning refrigerator is probably a:

Wähle eine der folgenden:

  • Psychrophile

  • Mesophile

  • Thermophile

  • Hyperthermophile

Erklärung

Frage 2 von 25

1

Active transport in necessary when:

Wähle eine der folgenden:

  • 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

Erklärung

Frage 3 von 25

1

The size of the most useful RNA molecule for prokaryotic evolutionary studies is:

Wähle eine der folgenden:

  • 5S

  • 16S

  • 18S

  • 23S

Erklärung

Frage 4 von 25

1

Siderophores:

Wähle eine der folgenden:

  • Act as a solvent for iron and transport it into the cells

  • Are a key component of cytochromes

  • Help maintain osmotic balance in seawater microbes

  • Develop when errors in membrane synthesis occur

Erklärung

Frage 5 von 25

1

Chemical energy is released when organic or inorganic compounds are:

Wähle eine der folgenden:

  • Reduced

  • Incorporated into larger molecules

  • Synthesized

  • Oxidized

Erklärung

Frage 6 von 25

1

MacConkey agar selects for:

Wähle eine der folgenden:

  • Gram-negative bacteria

  • Gram-positive bacteria

  • Both Gram-positive and Gram-negative bacteria

  • Haemolytic microorganisms

Erklärung

Frage 7 von 25

1

The bacterial genome is:

Wähle eine der folgenden:

  • Mostly diploid but includes several haploid regions

  • A single circular DNA molecule

  • Mostly haploid

  • A double stranded RNA molecule

Erklärung

Frage 8 von 25

1

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

Wähle eine der folgenden:

  • Plasmids are extra chromosomal DNA that encode only resistance to antibiotics

  • Plasmids are a part of bacterial chromosome

  • Plasmids are single stranded DNA found in some bacteria

  • Plasmids are extra chromosomal DNA molecules

Erklärung

Frage 9 von 25

1

The genomes of positive-sense RNA viruses:

Wähle eine der folgenden:

  • Can give rise to infectious virus if transfected into their host tissue culture cells

  • Are fully or partially translated immediately following uncoating in host cells

  • Need to be transcribed to produce mRNA molecules immediately after uncoating

  • Always carry a polymerase molecule in their mature capsid that functions after infection

Erklärung

Frage 10 von 25

1

The poliovirus mature virus particle:

Wähle eine der folgenden:

  • Contains 240 copies of a single protein

  • Contains 60 copies of four proteins

  • Has a dsDNA genome

  • Has a single stranded negative–sense genome

Erklärung

Frage 11 von 25

1

Which of the following organisms is NOT a true fungus (i.e. it is classified in the Kingdom Protoctista):

Wähle eine der folgenden:

  • Phytophthora infestans

  • Botrytis cinerea

  • Agaricus bisporus

  • Taphrina deformans

Erklärung

Frage 12 von 25

1

Black sigatoka is a:

Wähle eine der folgenden:

  • Fungal root disease of bananas

  • Fungal foliar disease of bananas

  • Fungal fruit disease of apples

  • Fungal foliar disease of potatoes

Erklärung

Frage 13 von 25

1

Which of the following is transmitted to humans by arthropods?

Wähle eine der folgenden:

  • Tuberculosis

  • Malaria

  • Cholera

  • Typhoid

Erklärung

Frage 14 von 25

1

Which of the following is a host component important in specific immune recognition of extracellular microbes?

Wähle eine der folgenden:

  • Antigen

  • Antibody

  • Phagocyte

  • Lipopolysaccharide

Erklärung

Frage 15 von 25

1

With regard to the differences between bacterial and eukaryotic cells which statement is the correct one?

Wähle eine der folgenden:

  • Bacterial cells do not contain mitochondria

  • Bacterial cells are usually larger than eukaryote cells

  • Bacteria do not contain a chromosome

  • Bacterial cells are not sensitive to β-lactam antibiotics

Erklärung

Frage 16 von 25

1

Koch’s postulates most correctly relate to which one of the following statements?

Wähle eine der folgenden:

  • The isolation of a bacterium in culture from a human alone indicates that it causes disease

  • Determination in a series logical steps the agent that causes disease

  • The observation of bacterial cells in tissue from a human with disease indicates that the observed bacterium has caused the disease

  • Inoculation of a bacterium into an animal to cause disease alone indicates that it is the cause of the disease observed

Erklärung

Frage 17 von 25

1

Which statement is correct with respect to Lipopolysaccharide (LPS)?

Wähle eine der folgenden:

  • LPS is found in Gram positive cells

  • LPS is found in Gram negative cells in the cytoplasmic membrane

  • LPS is found in the outer-membrane of Gram negative cells

  • LPS is associated with all bacterial cells

Erklärung

Frage 18 von 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?

Wähle eine der folgenden:

  • 6.3 x 10(7)

  • 6.3 x 10(8)

  • 6.3 x 10(6)

  • 6.3 x 10(5)

Erklärung

Frage 19 von 25

1

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

Wähle eine der folgenden:

  • 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

Erklärung

Frage 20 von 25

1

Which statement is correct with respect to peptidoglycan?

Wähle eine der folgenden:

  • There are multiple molecules of peptidoglycan in bacterial cell walls

  • Only Gram positive cells possess peptidoglycan

  • There is only a single molecule of peptidoglycan in a bacterial cell wall

  • Peptidoglycan is only found in Gram negative cell walls

Erklärung

Frage 21 von 25

1

Fungi primarily contribute to soil and plant health by:

Wähle eine der folgenden:

  • Degrading sand particles to release Si

  • Facilitating desiccation of water-logged soils

  • Degrading organic matter and releasing nutrients

  • Preventing bacterial growth

Erklärung

Frage 22 von 25

1

Fungi tend to live at interfaces. Which of these statements is untrue:

Wähle eine der folgenden:

  • This can be where nutrients are most concentrated

  • Solid surfaces may provide anchorage

  • Other microbes, that leak useful metabolites, may inhabit such niches

  • There is typically less water on physical surfaces and fungi avoid water

Erklärung

Frage 23 von 25

1

Fungal growth and cell division is not normally accompanied by:

Wähle eine der folgenden:

  • Biomass aquisition

  • Reduced vitality

  • Nucleic acid replication

  • Enhanced ability to compete with other microbial species

Erklärung

Frage 24 von 25

1

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

Wähle eine der folgenden:

  • Addition of benzene

  • Low water-activity

  • Refrigeration

  • Heat-sterilization

Erklärung

Frage 25 von 25

1

Saprophytic activity is essential for biosphere health because it:

Wähle eine der folgenden:

  • Facilitates nutrient cycling and waste degradation

  • Kills host organisms and thereby averts overpopulation

  • Facilitates species evolution via endosymbiosis

  • Involves mineralization of inorganic rocks in the lithosphere

Erklärung

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