Chapter 21 Review Questions
Which of the following is NOT used to treat active viral disease?
Antibiotics
People with CCR5 *delta* 32 mutation of a T-cell surface protein can be exposed to some strains of HIV-1 without becoming sick. What step of the virus life cycle is likely to be inhibited with this mutation?
Attachment
The viral _______ play(s) a role in attaching a virion to the host cell.
Capsid & Envelope
Which is true of DNA viruses?
They use the host cell's machinery to produce new copies of their genome.
Viruses......
Vary in shape
Which statement is true?
Viruses are acellular.
Oncogenic virus cores can be
either RNA or DNA
Vaccines
stimulate an immune response
Which of the following is not associated with prions?
DNA
Which statement is true of viral replication?
During attachment, the virus attaches at specific sites on the cell surface.
Which of the following statements is true about virus structure?
Glycoproteins help the virus attach to the host cell
A patient presents at the clinic with an acute viral infection. Assays that analyze the viral life cycle classify the virus into Group V with a segmented genome. Which virus is the most likely diagnosis for the patient?
Influenza A virus
Which statement is ns true of reverse transcriptase?
It transcribes RNA to make DNA
Which statement is not true of viral replication?
Newly released virions can infect adjacent cells.
A scientist discovers a new virus with a linear, RNA genome surrounded by a helical capsid. The virus is most likely a member of which family based on structure classification?
Rabies Virus
The observation that the bacteria genus Chlamydia contains species that can only survive as intracellular parasites supports which viral origin hypothesis?
Regressive
An apple grower notices that several of his apple trees with fungi growing on their trunks have developed necrotic ring spots, while other trees in the orchard tha lack the fungi appear healthy. What is the most likely conclusion the farmer can make about the virus infecting his apple tree?
The apple trees were infected by horizontal transmission
Which is true of viroids?
They are single stranded RNA particles
A bacteriophage can infect
bacteria
