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Microorganisms MCQ's 2010

Description

Papers covered; May 2010
tj.sloan
Quiz by tj.sloan, updated more than 1 year ago
tj.sloan
Created by tj.sloan over 9 years ago
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Resource summary

Question 1

Question
A microbe growing in a functioning refrigerator is probably a:
Answer
  • Psychrophile
  • Mesophile
  • Thermophile
  • Hyperthermophile

Question 2

Question
Active transport in 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 3

Question
The size of the most useful RNA molecule for prokaryotic evolutionary studies is:
Answer
  • 5S
  • 16S
  • 18S
  • 23S

Question 4

Question
Siderophores:
Answer
  • 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

Question 5

Question
Chemical energy is released when organic or inorganic compounds are:
Answer
  • Reduced
  • Incorporated into larger molecules
  • Synthesized
  • Oxidized

Question 6

Question
MacConkey agar selects for:
Answer
  • Gram-negative bacteria
  • Gram-positive bacteria
  • Both Gram-positive and Gram-negative bacteria
  • Haemolytic microorganisms

Question 7

Question
The bacterial genome is:
Answer
  • Mostly diploid but includes several haploid regions
  • A single circular DNA molecule
  • Mostly haploid
  • A double stranded RNA molecule

Question 8

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

Question 9

Question
The genomes of positive-sense RNA viruses:
Answer
  • 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

Question 10

Question
The poliovirus mature virus particle:
Answer
  • Contains 240 copies of a single protein
  • Contains 60 copies of four proteins
  • Has a dsDNA genome
  • Has a single stranded negative–sense genome

Question 11

Question
Which of the following organisms is NOT a true fungus (i.e. it is classified in the Kingdom Protoctista):
Answer
  • Phytophthora infestans
  • Botrytis cinerea
  • Agaricus bisporus
  • Taphrina deformans

Question 12

Question
Black sigatoka is a:
Answer
  • Fungal root disease of bananas
  • Fungal foliar disease of bananas
  • Fungal fruit disease of apples
  • Fungal foliar disease of potatoes

Question 13

Question
Which of the following is transmitted to humans by arthropods?
Answer
  • Tuberculosis
  • Malaria
  • Cholera
  • Typhoid

Question 14

Question
Which of the following is a host component important in specific immune recognition of extracellular microbes?
Answer
  • Antigen
  • Antibody
  • Phagocyte
  • Lipopolysaccharide

Question 15

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

Question 16

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

Question 17

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

Question 18

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 19

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 20

Question
Which statement is correct with respect to peptidoglycan?
Answer
  • 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

Question 21

Question
Fungi primarily contribute to soil and plant health by:
Answer
  • Degrading sand particles to release Si
  • Facilitating desiccation of water-logged soils
  • Degrading organic matter and releasing nutrients
  • Preventing bacterial growth

Question 22

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

Question 23

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

Question 24

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

Question 25

Question
Saprophytic activity is essential for biosphere health because it:
Answer
  • 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
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