Ch.18 Viruses Flashcards
________ is a viral illness that affects nearly 50 million Americans each year.
a. Influenza (“flu”)
b. Tuberculosis
c. Diphtheria
d. Osteoporosis
Influenza (“flu”)
______ 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
Adolf Meyer
All viruses have an outer protein coat known as the ________.
a. capsomere
b. envelope
c. capsid
d. capsule
capsid
Viruses that do not have an envelope are called ________ viruses.
a. uncoated
b. naked
c. unencapsulated
d. unenveloped
naked
Bacteriophages are viruses that infect ________.
a. bacteria
b. other viruses
c. plants
d. all of the above
bacteria
Viruses that are ________ undergo only the lytic cycle.
a. temperate
b. virulent
c. enveloped
d. latent
virulent
________ is the first phase of the bacteriophage life cycle.
a. Integration
b. Entry, or penetration,
c. Attachment
d. Synthesis and assembly
Attachment
Some viruses undergo a period of nonactivity in their life cycle and are said to be ________.
a. latent
b. virulent
c. infectious
d. harmless
Latent
Viroids cause disease in ________.
a. animals
b. plants
c. humans
d. all of the above
Plants
Diseases caused by prions affect the ________ system.
a. nervous
b. cardiovascular
c. urinary
d. digestive
Nervous
Because ________ do NOT have nucleic acids, they are difficult to eradicate.
a. viroids
b. prions
c. viruses
d. bacteria
prions
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
All of the above
Which of the following diseases is caused by a naked virus?
a. Herpes.
b. Polio.
c. Influenza.
d. Rabies.
Polio
Which of the following diseases is caused by an enveloped virus?
a. AIDS.
b. Herpes.
c. Smallpox.
d. All of the above.
All of the above
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.
Entry, or penetration
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.
All of the above
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.
Hepatitis A.
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.
All of the above
Which of the following viral diseases is transmitted by sharing body fluids?
a. Influenza.
b. Tuberculosis.
c. Genital herpes.
d. Common cold.
Genetial herpes
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.
Most have a limited host range
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.
All of the above
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.
e. A and B
Which of the following is a double-stranded RNA virus?
a. Parvovirus.
b. Cystovirus.
c. Orthomyxovirus.
d. Poxvirus.
Cystovirus
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.
All of the above
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.
It causes severe acute respiratory syndrome (SARS).
Which of the following is a double-stranded DNA virus that causes viral pneumonia?
a. Togavirus.
b. Reovirus.
c. Adenovirus.
d. Poxvirus.
Adenovirus.
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.
Integration of the viral genome into the genetic material of the host cell
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.
All of the above
Herpes viruses cause which of the following diseases?
a. Mononucleosis.
b. Cold sores.
c. Genital herpes.
d. All of the above.
All of the above
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
Latent period
