Ch.18 Viruses

Question 1

________ is a viral illness that affects nearly 50 million Americans each year.
a. Influenza (“flu”)
b. Tuberculosis
c. Diphtheria
d. Osteoporosis

Answer 1

Influenza (“flu”)

Question 2

______ named the agent responsible for tobacco mosaic disease as “tobacco mosaic virus,” thereby establishing the causative agent.
a. Adolf Meyer
b. Martinus Beijerinck
c. Wendell Stanley
d. David Baltimore

Answer 2

Adolf Meyer

Question 3

All viruses have an outer protein coat known as the ________.
a. capsomere
b. envelope
c. capsid
d. capsule

Answer 3

capsid

Question 4

Viruses that do not have an envelope are called ________ viruses.
a. uncoated
b. naked
c. unencapsulated
d. unenveloped

Answer 4

naked

Question 5

Bacteriophages are viruses that infect ________.
a. bacteria
b. other viruses
c. plants
d. all of the above

Answer 5

bacteria

Question 6

Viruses that are ________ undergo only the lytic cycle.
a. temperate
b. virulent
c. enveloped
d. latent

Answer 6

virulent

Question 7

________ is the first phase of the bacteriophage life cycle.
a. Integration
b. Entry, or penetration,
c. Attachment
d. Synthesis and assembly

Answer 7

Attachment

Question 8

Some viruses undergo a period of nonactivity in their life cycle and are said to be ________.
a. latent
b. virulent
c. infectious
d. harmless

Answer 8

Latent

Question 9

Viroids cause disease in ________.
a. animals
b. plants
c. humans
d. all of the above

Answer 9

Plants

Question 10

Diseases caused by prions affect the ________ system.
a. nervous
b. cardiovascular
c. urinary
d. digestive

Answer 10

Nervous

Question 11

Because ________ do NOT have nucleic acids, they are difficult to eradicate.
a. viroids
b. prions
c. viruses
d. bacteria

Answer 11

prions

Question 12

Influenza, the common cold, smallpox, and herpes are all illnesses that ________.
a. infect humans
b. are caused by viruses
c. are highly contagious
d. all of the above

Answer 12

All of the above

Question 13

Which of the following diseases is caused by a naked virus?
a. Herpes.
b. Polio.
c. Influenza.
d. Rabies.

Answer 13

Polio

Question 14

Which of the following diseases is caused by an enveloped virus?
a. AIDS.
b. Herpes.
c. Smallpox.
d. All of the above.

Answer 14

All of the above

Question 15

Which of the following phases of the bacteriophage life cycle involves insertion of the viral genome into the host cell?
a. Adsorption, or attachment.
b. Entry, or penetration.
c. Integration.
d. Synthesis and assembly.

Answer 15

Entry, or penetration

Question 16

What typically happens in the life cycle of the virus that causes cold sores?
a. The virus has a period of nonactivity.
b. The virus is activated during entry.
c. Virus particles are released slowly.
d. All of the above.

Answer 16

All of the above

Question 17

Which of the following is NOT a prion disease?
a. Kuru in humans.
b. Scrapie in sheep and goats.
c. Hepatitis A.
d. Creutzfeldt-Jakob disease.

Answer 17

Hepatitis A.

Question 18

Viroids are transmitted by which of the following means?
a. In pollen grains.
b. In seeds via sucking insects.
c. Via pruning.
d. All of the above.

Answer 18

All of the above

Question 19

Which of the following viral diseases is transmitted by sharing body fluids?
a. Influenza.
b. Tuberculosis.
c. Genital herpes.
d. Common cold.

Answer 19

Genetial herpes

Question 20

Which of the following is a characteristic of viruses?
a. They are structurally very complex.
b. Most have a limited host range.
c. They are larger than bacteria.
d. Only a few of them cause disease.

Answer 20

Most have a limited host range

Question 21

Which of the following statements regarding viruses are true?
a. The status of viruses, living or non-living, has been debated for years.
b. Our ancestors thought diseases were caused by poison and evil spirits.
c. “Tobacco mosaic virus” infects many plants in addition to tobacco plants.
d. All of the above.

Answer 21

All of the above

Question 22

Ancient Chinese medicine practices included:
a. molds to prevent and treat disease.
b. pus-soaked rags placed in the nose to develop immunity.
c. use of gold-salts for rheumatic conditions.
d. A, B, and C.
e. A and B.

Answer 22

e. A and B

Question 23

Which of the following is a double-stranded RNA virus?
a. Parvovirus.
b. Cystovirus.
c. Orthomyxovirus.
d. Poxvirus.

Answer 23

Cystovirus

Question 24

Which of the following is a characteristic of temperate viruses?
a. Integrate their genetic material into the host cell genome.
b. Undergo both the lysogenic and the lytic cycle.
c. Eventually destroy the host cell.
d. All of the above.

Answer 24

All of the above

Question 25

Which of the following is true of coronavirus?
a. It is a double-stranded DNA virus.
b. It causes severe acute respiratory syndrome (SARS).
c. It is a naked virus.
d. It causes monkeypox.

Answer 25

It causes severe acute respiratory syndrome (SARS).

Question 26

Which of the following is a double-stranded DNA virus that causes viral pneumonia?
a. Togavirus.
b. Reovirus.
c. Adenovirus.
d. Poxvirus.

Answer 26

Adenovirus.

Question 27

Which of the following does NOT occur in the lytic cycle?
a. Insertion of the viral genome into the host cell.
b. Integration of the viral genome into the genetic material of the host cell.
c. Lysis of the host cell.
d. Synthesis of the viral capsid.

Answer 27

Integration of the viral genome into the genetic material of the host cell

Question 28

Which of the following occurs during the assembly phase of the bacteriophage life cycle?
a. Replication of the viral genome.
b. Synthesis of the viral capsid.
c. Maturation of the viral particles.
d. All of the above.

Answer 28

All of the above

Question 29

Herpes viruses cause which of the following diseases?
a. Mononucleosis.
b. Cold sores.
c. Genital herpes.
d. All of the above.

Answer 29

All of the above

Question 30

A period of nonactivity in a typical virus life cycle is known as a/an ______.
a. lytic period
b. virulent period
c. integrative period
d. latent period

Answer 30

Latent period