Question 1

Because viruses have limited genetic material, their mutation rates are very low.

Accepted Answer

A) True 
 B)False

Question 2

The causative agents of bubonic plague, which killed 100 million people during the 14th century, were

Accepted Answer

A)   fish.
B)   rats.
C)   fleas.
D)   viruses.
E)   bacteria.F) C) and D)
G) All of the above

Question 3

AIDS is caused by a

Accepted Answer

A)   bacterium.
B)   prion.
C)   virus.
D)   viroid.
E)   fungus.F) A) and D)
G) B) and C)

Question 4

Antibiotics can be effective only against a

Accepted Answer

A)   virus.
B)   prion.
C)   bacterium.
D)   viroid.E) C) and D)
F) A) and B)

Question 5

The classifications gram- positive and gram- negative are based on of the bacterial cell wall.

Accepted Answer

The answer of The classifications gram- positive and gram- negative...

Question 6

Which of the following plants contains nitrogen- fixing bacteria in its root nodules?

Accepted Answer

A)   Oranges
B)   Tomatoes
C)   Corn
D)   Soybeans
E)   PotatoesF) A) and B)
G) B) and C)

Question 7

In bacteria, the small, circular pieces of DNA that are located outside the chromosome are called

Accepted Answer

A)   endospores.
B)   bacteriophages.
C)   plasmids.
D)   flagella.
E)   sex pili.F) All of the above
G) A) and B)

Question 8

What do the sticky layers of protective slime produced by some bacteria enable them to do?

Accepted Answer

A)   Stick together and form biofilms
B)   Move from one location to another
C)   Survive extreme conditions for long periods of time
D)   Sexually reproduce
E)   Acquire resistance to antibioticsF) A) and E)
G) B) and C)

Question 9

Tetanus is caused by bacteria that grow in deep puncture wounds.

Accepted Answer

The answer of Tetanus is caused by bacteria that grow...

Question 10

Avocado sunblotch is caused by a

Accepted Answer

A)   bacterium.
B)   prion.
C)   virus.
D)   viroid.
E)   fungus.F) None of the above
G) C) and D)

Question 11

The common cold is caused by a

Accepted Answer

A)   bacterium.
B)   prion.
C)   virus.
D)   viroid.
E)   fungus.F) D) and E)
G) C) and E)

Question 12

Bacterial endospores are used for

Accepted Answer

A)   forming biofilms.
B)   keeping the bacteria alive under harsh conditions.
C)   attracting viruses.
D)   bioremediation.
E)   bacterial reproduction.F) B) and C)
G) A) and E)

Question 13

Which of the following is a normal inhabitant of a cow's digestive tract that can cause harm to people when it contaminates ground beef?

Accepted Answer

A)   Borrelia burgdorferi
B)   Yersinia pestis
C)   Clostridium tetani
D)   Escherichia coli
E)   Streptococcus pneumoniaeF) A) and C)
G) B) and C)

Question 14

Through which process are bacteria able to exchange genetic material?

Accepted Answer

A)   Conjugation
B)   Sexual reproduction
C)   Photosynthesis
D)   Anaerobic respiration
E)   Endospore formationF) B) and E)
G) D) and E)

Question 15

A particle that lacks all organelles and must always reproduce as an intracellular parasite is a(n) _.

Accepted Answer

The answer of A particle that lacks all organelles and...

Question 16

You discover a new particle. It has only RNA as a nucleic acid and lacks both a membrane and cytoplasm. This particle is a(n)

Accepted Answer

A)   virus.
B)   prion.
C)   archaea.
D)   bacteria.
E)   fungus.F) B) and D)
G) C) and D)

Question 17

Viroids

Accepted Answer

A)   are infectious pieces of DNA enclosed in a protein coat.
B)   have a plasma membrane.
C)   are infectious chains of amino acids.
D)   attack bacteria.
E)   are infectious pieces of RNA.F) D) and E)
G) All of the above

Question 18

Unlike aerobic prokaryotes, anaerobic prokaryotes can obtain energy when is not available.

Accepted Answer

The answer of Unlike aerobic prokaryotes, anaerobic prokaryotes can obtain...

Question 19

What differentiates gram- positive bacteria from gram- negative bacteria?

Accepted Answer

A)   The use of oxygen
B)   The way the cell wall stains
C)   Nutrient requirements
D)   The means of locomotion
E)   The appearance of coloniesF) A) and E)
G) B) and C)

Question 20

All bacteria are harmful to humans.

Accepted Answer

A) True 
 B)False

Exam 20: The Diversity of Prokaryotes and Viruses

A particle that lacks all organelles and must always reproduce as an intracellular parasite is a(n) _.

Correct AnswerverifiedShow Answer

Avocado sunblotch is caused by a

Correct AnswerverifiedShow Answer

AIDS is caused by a

Correct AnswerverifiedShow Answer

Because viruses have limited genetic material, their mutation rates are very low.

Correct AnswerverifiedShow Answer

In bacteria, the small, circular pieces of DNA that are located outside the chromosome are called

Correct AnswerverifiedShow Answer

The causative agents of bubonic plague, which killed 100 million people during the 14th century, were

Correct AnswerverifiedShow Answer

What differentiates gram- positive bacteria from gram- negative bacteria?

Correct AnswerverifiedShow Answer

Through which process are bacteria able to exchange genetic material?

Correct AnswerverifiedShow Answer

What do the sticky layers of protective slime produced by some bacteria enable them to do?

Correct AnswerverifiedShow Answer

You discover a new particle. It has only RNA as a nucleic acid and lacks both a membrane and cytoplasm. This particle is a(n)

Correct AnswerverifiedShow Answer

Which of the following is a normal inhabitant of a cow's digestive tract that can cause harm to people when it contaminates ground beef?

Correct AnswerverifiedShow Answer

The classifications gram- positive and gram- negative are based on of the bacterial cell wall.

Correct AnswerverifiedShow Answer

Unlike aerobic prokaryotes, anaerobic prokaryotes can obtain energy when is not available.

Correct AnswerverifiedShow Answer

Antibiotics can be effective only against a

Correct AnswerverifiedShow Answer

Bacterial endospores are used for

Correct AnswerverifiedShow Answer

The common cold is caused by a

Correct AnswerverifiedShow Answer

Viroids

Correct AnswerverifiedShow Answer

Tetanus is caused by bacteria that grow in deep puncture wounds.

Correct AnswerverifiedShow Answer

Which of the following plants contains nitrogen- fixing bacteria in its root nodules?

Correct AnswerverifiedShow Answer

All bacteria are harmful to humans.

Correct AnswerverifiedShow Answer

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