Question 1

Facilitated diffusion and active transport require a carrier protein to mediate the movement across the plasma membrane.

Accepted Answer

A) True 
 B)False

Question 2

The phase of the bacterial growth curve during which microbial growth slows and the rate of multiplication equals the rate of cell death is the

Accepted Answer

A)  lag phase.
B)  log phase.
C)  stationary phase.
D)  death phase.
E)  telophase.F) A) and B)
G) B) and E)

Question 3

Cyanobacteria live in aquatic environments and are photosynthetic.The aquatic environment is their __________ and their role as a primary producer is their ____________.

Accepted Answer

A)  habitat; purpose
B)  habitat; niche
C)  niche; habitat
D)  host; functionE) None of the above
F) B) and C)

Question 4

Saprobes do not need a carbon source for growth and metabolism.

Accepted Answer

A) True 
 B)False

Question 5

The use of energy by a cell to enclose a substance in its membrane by forming a vacuole and engulfing it is called

Accepted Answer

A)  facilitated diffusion.
B)  diffusion.
C)  active transport.
D)  osmosis.
E)  endocytosis.F) B) and D)
G) B) and C)

Question 6

In a commensal relationship, the commensal benefits but the cohabitant is neither harmed nor benefited.

Accepted Answer

A) True 
 B)False

Question 7

Phosphorus is one of the major elements needed in larger quantities by microorganisms.

Accepted Answer

A) True 
 B)False

Question 8

Microorganisms require small quantities of this nutrient for enzyme function and maintenance of protein structure.

Accepted Answer

A)  element
B)  macronutrient
C)  water
D)  growth factors
E)  trace elementF) A) and B)
G) A) and D)

Question 9

Which location would best support the growth of a halophile?

Accepted Answer

A)  acid pools
B)  freshwater ponds
C)  hot geyser springs
D)  arid desert soil
E)  salt lakesF) All of the above
G) B) and E)

Question 10

Most microorganisms on Earth can only live and survive in habitats that are similar to human body conditions.

Accepted Answer

A) True 
 B)False

Question 11

Nutrient absorption is mediated by the

Accepted Answer

A)  cell wall.
B)  peptidoglycan layer.
C)  proteins in the periplasmic space.
D)  cell membrane.
E)  nuclear membrane.F) C) and E)
G) A) and C)

Question 12

Contractile vacuoles are

Accepted Answer

A)  used to expel excess water from cells.
B)  found in bacterial cells.
C)  important to certain organisms in hypertonic environments.
D)  protein carriers in cell membranes.
E)  used to bring solutes into a cell.F) A) and E)
G) A) and D)

Question 13

A microorganism that does not have catalase or superoxide dismutase would find it difficult to live in an environment with

Accepted Answer

A)  carbon dioxide.
B)  oxygen.
C)  high salt.
D)  temperatures above 37°C.
E)  high acidity.F) C) and E)
G) D) and E)

Question 14

In _____ conditions, the cell wall will help prevent the cell from bursting.

Accepted Answer

A)  hypertonic
B)  hypotonic
C)  isotonic
D)  mesotonic
E)  All of these choices are correct.F) A) and D)
G) A) and B)

Question 15

Facilitated diffusion is limited by

Accepted Answer

A)  ATP concentration.
B)  the number of carrier proteins in the membrane.
C)  size of the pores in the membrane.
D)  osmotic pressure.
E)  the size of the cell.F) C) and D)
G) A) and D)

Question 16

A microorganism that has an optimum growth temperature of 37°C, but can survive short exposure to high temperatures is called

Accepted Answer

A)  an extremophile.
B)  a thermophile.
C)  a psychrophile.
D)  a facultative psychrophile.
E)  thermoduric.F) None of the above
G) D) and E)

Question 17

A saprobe with a cell wall will utilize extracellular digestion.

Accepted Answer

A) True 
 B)False

Question 18

Bacterial endosymbionts have lost much of their genome and are dependent upon their aphid hosts for survival.Similarly, the aphids depend on the endosymbiotic bacteria for the supply of amino acids that they provide.This interdependence is the result of

Accepted Answer

A)  coevolution.
B)  syntrophy.
C)  amensalism.
D)  microbial antagonism.E) B) and D)
F) C) and D)

Question 19

When it is important to count the number of cells, determine cell size and differentiate between dead and live cells a ___ is used.

Accepted Answer

A)  Coulter counter
B)  flow cytometer
C)  SEM
D)  methylene dye indicator
E)  plate countF) C) and E)
G) A) and E)

Question 20

Which location would best support the growth of a barophile?

Accepted Answer

A)  acid pools
B)  deep oceans
C)  hot geyser springs
D)  arid desert soil
E)  salt lakesF) A) and E)
G) All of the above

Exam 7: Microbial Nutrition, Ecology, and Growth

Which location would best support the growth of a barophile?

Correct AnswerverifiedShow Answer

In a commensal relationship, the commensal benefits but the cohabitant is neither harmed nor benefited.

Correct AnswerverifiedShow Answer

Saprobes do not need a carbon source for growth and metabolism.

Correct AnswerverifiedShow Answer

The use of energy by a cell to enclose a substance in its membrane by forming a vacuole and engulfing it is called

Correct AnswerverifiedShow Answer

Bacterial endosymbionts have lost much of their genome and are dependent upon their aphid hosts for survival.Similarly, the aphids depend on the endosymbiotic bacteria for the supply of amino acids that they provide.This interdependence is the result of

Correct AnswerverifiedShow Answer

Nutrient absorption is mediated by the

Correct AnswerverifiedShow Answer

Phosphorus is one of the major elements needed in larger quantities by microorganisms.

Correct AnswerverifiedShow Answer

Cyanobacteria live in aquatic environments and are photosynthetic.The aquatic environment is their __________ and their role as a primary producer is their ____________.

Correct AnswerverifiedShow Answer

When it is important to count the number of cells, determine cell size and differentiate between dead and live cells a ___ is used.

Correct AnswerverifiedShow Answer

Facilitated diffusion and active transport require a carrier protein to mediate the movement across the plasma membrane.

Correct AnswerverifiedShow Answer

The phase of the bacterial growth curve during which microbial growth slows and the rate of multiplication equals the rate of cell death is the

Correct AnswerverifiedShow Answer

In _____ conditions, the cell wall will help prevent the cell from bursting.

Correct AnswerverifiedShow Answer

Contractile vacuoles are

Correct AnswerverifiedShow Answer

A microorganism that has an optimum growth temperature of 37°C, but can survive short exposure to high temperatures is called

Correct AnswerverifiedShow Answer

Microorganisms require small quantities of this nutrient for enzyme function and maintenance of protein structure.

Correct AnswerverifiedShow Answer

Most microorganisms on Earth can only live and survive in habitats that are similar to human body conditions.

Correct AnswerverifiedShow Answer

A microorganism that does not have catalase or superoxide dismutase would find it difficult to live in an environment with

Correct AnswerverifiedShow Answer

Which location would best support the growth of a halophile?

Correct AnswerverifiedShow Answer

Facilitated diffusion is limited by

Correct AnswerverifiedShow Answer

A saprobe with a cell wall will utilize extracellular digestion.

Correct AnswerverifiedShow Answer

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Cyanobacteria live in aquatic environments and are photosynthetic.The aquatic environment is their and their role as a primary producer is their __.

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