Question 1

The phase of the bacterial growth curve that shows the maximum rate of cell division is the ______.

Accepted Answer

A)   death phase
B)   lag phase
C)   prophase
D)   exponential phase
E)   stationary phaseF) D) and E)
G) C) and D)

Question 2

Microorganisms require large quantities of ______ for use in cell structure and metabolism.

Accepted Answer

A)   water
B)   growth factors
C)   macronutrients
D)   trace elements
E)   electrolytesF) C) and D)
G) D) and E)

Question 3

A halophile would grow best in ______.

Accepted Answer

A)   fresh water ponds
B)   hot geyser springs
C)   arid, desert soil
D)   acid pools
E)   salt lakesF) A) and C)
G) B) and E)

Question 4

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

Accepted Answer

A)   temperatures above 37° C
B)   high salt
C)   carbon dioxide
D)   oxygen
E)   high acidityF) All of the above
G) A) and E)

Question 5

A Coulter counter can count viable cells as well as determine their size.

Accepted Answer

A) True 
 B)False

Question 6

Whether an organism is a phototroph or a chemotroph depends on its source of energy.

Accepted Answer

A) True 
 B)False

Question 7

The phase of the bacterial growth curve in which newly inoculated cells are adjusting to their new environment,metabolizing but not growing at an exponential rate,is the ______.

Accepted Answer

A)   stationary phase
B)   prophase
C)   death phase
D)   lag phase
E)   exponential phaseF) A) and B)
G) C) and D)

Question 8

Mediated transport of polar molecules and ions across the plasma membrane utilizes a(n) _____ carrier that binds to the substance and causes a conformational change to allow its movement across the membrane.

Accepted Answer

A)   porin
B)   lipid
C)   protein
D)   enzymeE) A) and D)
F) None of the above

Question 9

Microorganisms that live in severe habitats,such as very hot,acidic,or salty environments,are called ______.

Accepted Answer

A)   halophiles
B)   thermophiles
C)   psychrophiles
D)   barophiles
E)   extremophilesF) A) and E)
G) C) and D)

Question 10

Which organism has a challenge to maintain cellular electrolyte and fluid balance in its environment?

Accepted Answer

A)   A protozoan in a fresh water lake
B)   A bacterium in a fresh-water lake
C)   A bacterium in Great Salt Lake
D)   All of the above have problems in maintaining electrolyte and fluid balance within the cell.E) All of the above
F) C) and D)

Question 11

Organisms that feed on dead organisms for nutrients are called ______.

Accepted Answer

A)   lithoautotrophs
B)   parasites
C)   autotrophs
D)   saprobes
E)   phototrophsF) B) and E)
G) A) and D)

Question 12

Endospore-forming bacteria like Bacillus species begin the sporulation process with an asymmetric cell division to produce two cells with different fates.One will differentiate into the endospore,and the other is the sporangium that will ultimately lyse to release the mature endospore.During this asymmetric cell division,one of the compartments does not receive an intact copy of the chromosome.Which compartment can function with only part of the genome and why?

Accepted Answer

A)   The sporangium; much of the genome is "junk DNA" and not required for endospore maturation.
B)   The sporangium; it supports endospore development and then lyses.
C)   The endospore; the endospore is built from the outside via the sporangium and not from the inside.
D)   The endospore; it is a dormant stage and requires very little to maintain its dormancy.E) A) and B)
F) A) and C)

Question 13

Facilitated diffusion is limited by

Accepted Answer

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

Question 14

All of the following could find a location in or on human body tissues suitable for growth except ______.

Accepted Answer

A)   capnophiles
B)   mesophiles
C)   anaerobes
D)   psychrophiles
E)   facultative anaerobesF) A) and C)
G) C) and D)

Question 15

A saprobe with a cell wall will utilize extracellular digestion.

Accepted Answer

A) True 
 B)False

Question 16

The time it takes for a freshly inoculated agar culture to develop visible colonies is primarily governed by the generation time of that species.

Accepted Answer

A) True 
 B)False

Question 17

Bacteria living in a freshwater stream that are transferred to ocean water would

Accepted Answer

A)   be in an isotonic solution.
B)   gain water.
C)   be in a hypotonic solution.
D)   become dehydrated due to the loss of water.E) C) and D)
F) None of the above

Question 18

Microbes in a biofilm use quorum sensing to

Accepted Answer

A)   assess the size of a particular microbial population.
B)   transfer genetic material among individual cells.
C)   inactivate antibiotic molecules.
D)   attach to surfaces.E) A) and B)
F) B) and D)

Question 19

A loopful of bacteria containing 1000 bacterial cells is inoculated into a nutrient broth and incubated.After a negligible lag phase,the culture goes into exponential growth for two hours.The generation time for the bacterium is fifteen minutes.Which equation is the correct one to determine the number of cells present after two hours of log phase growth?

Accepted Answer

A)   1000 X 2 X 2 X 15
B)   1000 X 28
C)   1000 X 16
D)   1000 X 22E) None of the above
F) A) and D)

Question 20

A saprobe differs from a parasite in that

Accepted Answer

A)   a saprobe is a fungus, but a parasite can be any type of microbe.
B)   a saprobe cannot infect a human, but a parasite is always infectious.
C)   a saprobe derive nutrients from dead plants and animals, but a parasite derives nutrients from living plants and animals.
D)   a saprobe does not harm a host that it lives on, whereas a parasite does harm a host.E) A) and B)
F) B) and D)

Exam 15: Host Defenses II: Specific Immunity and Immunization

Organisms that feed on dead organisms for nutrients are called ______.

Correct Answer
verified

Microorganisms that live in severe habitats,such as very hot,acidic,or salty environments,are called ______.

Correct Answer
verified

Correct Answer
verified

Bacteria living in a freshwater stream that are transferred to ocean water would

Correct Answer
verified

The phase of the bacterial growth curve in which newly inoculated cells are adjusting to their new environment,metabolizing but not growing at an exponential rate,is the ______.

Correct Answer
verified

Which organism has a challenge to maintain cellular electrolyte and fluid balance in its environment?

Correct Answer
verified

The time it takes for a freshly inoculated agar culture to develop visible colonies is primarily governed by the generation time of that species.

Correct Answer
verified

Correct Answer
verified

The phase of the bacterial growth curve that shows the maximum rate of cell division is the ______.

Correct Answer
verified

A saprobe with a cell wall will utilize extracellular digestion.

Correct Answer
verified

A Coulter counter can count viable cells as well as determine their size.

Correct Answer
verified

Microbes in a biofilm use quorum sensing to

Correct Answer
verified

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

Correct Answer
verified

A saprobe differs from a parasite in that

Correct Answer
verified

Microorganisms require large quantities of ______ for use in cell structure and metabolism.

Correct Answer
verified

All of the following could find a location in or on human body tissues suitable for growth except ______.

Correct Answer
verified

Mediated transport of polar molecules and ions across the plasma membrane utilizes a(n) _____ carrier that binds to the substance and causes a conformational change to allow its movement across the membrane.

Correct Answer
verified

Whether an organism is a phototroph or a chemotroph depends on its source of energy.

Correct Answer
verified

Facilitated diffusion is limited by

Correct Answer
verified

A halophile would grow best in ______.

Correct Answer
verified

Exam 15: Host Defenses II: Specific Immunity and Immunization

Organisms that feed on dead organisms for nutrients are called ______.

Correct AnswerverifiedShow Answer

Microorganisms that live in severe habitats,such as very hot,acidic,or salty environments,are called ______.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Bacteria living in a freshwater stream that are transferred to ocean water would

Correct AnswerverifiedShow Answer

The phase of the bacterial growth curve in which newly inoculated cells are adjusting to their new environment,metabolizing but not growing at an exponential rate,is the ______.

Correct AnswerverifiedShow Answer

Which organism has a challenge to maintain cellular electrolyte and fluid balance in its environment?

Correct AnswerverifiedShow Answer

The time it takes for a freshly inoculated agar culture to develop visible colonies is primarily governed by the generation time of that species.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The phase of the bacterial growth curve that shows the maximum rate of cell division is the ______.

Correct AnswerverifiedShow Answer

A saprobe with a cell wall will utilize extracellular digestion.

Correct AnswerverifiedShow Answer

A Coulter counter can count viable cells as well as determine their size.

Correct AnswerverifiedShow Answer

Microbes in a biofilm use quorum sensing to

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

A saprobe differs from a parasite in that

Correct AnswerverifiedShow Answer

Microorganisms require large quantities of ______ for use in cell structure and metabolism.

Correct AnswerverifiedShow Answer

All of the following could find a location in or on human body tissues suitable for growth except ______.

Correct AnswerverifiedShow Answer

Mediated transport of polar molecules and ions across the plasma membrane utilizes a(n) _____ carrier that binds to the substance and causes a conformational change to allow its movement across the membrane.

Correct AnswerverifiedShow Answer

Whether an organism is a phototroph or a chemotroph depends on its source of energy.

Correct AnswerverifiedShow Answer

Facilitated diffusion is limited by

Correct AnswerverifiedShow Answer

A halophile would grow best in ______.

Correct AnswerverifiedShow Answer

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