Exam 8: Viruses and Virology

Influenza is an acute human viral disease that causes brief cellular damage followed by healing and complete clearing of the virus from the body. Hepatitis C is a chronic viral disease that causes slow destruction of tissue and persistent virions that are not completely cleared.Which of these diseases is more likely to be caused by lytic virus and which is caused by a lysogenic virus?

The latent phase in the viral growth curve and the lag phase of the bacterial growth curve are equivalent and represent the time it takes for the virus or bacterium to adapt to the culture conditions and begin growing.

How do bacteriophage influence bacterial evolution?

Viral size is generally measured in

There is at least one known virus whose genome is actually larger than a cellular genome.

The size and shape of viral particles is largely governed by the size and packaging of the viral

An RNA genome itself serves as mRNA in negative-stranded RNA viruses.

RNA viruses encode host restriction systems designed to destroy host DNA.

Why do scientists believe that most of the unexplored genetic diversity on Earth resides in viral genomes? Why is this genetic diversity important to human society?

Viral replication is

The primer for retrovirus reverse transcription is a specific

Based on your knowledge of cellular and viral processes,which of the following would be (an)appropriate target(s)for antiviral drugs?

Explain the relationship between the terms virus particle,virion,and virus genome.

A lytic infection results in death of the host cell.

In E.coli,the adenine in the sequence GATC is methylated by the Dam enzyme.In the same cells a restriction endonuclease recognizes and cleaves dsDNA with GATC on either strand.Why does E.coli have these two enzymes?

Which of the following enzymes would you expect to find in the virion of a retrovirus,but NOT in a bacteriophage?

When a virus enters a host cell in which it can replicate,the process is called a(n)

Compare and contrast a typical bacterial growth curve and a viral one-step growth curve.Explain why the growth curves are different based on bacterial and viral replication.

Relate the structure of bacteriophages and animal viruses to the structure of their respective host cells and the steps of the viral life cycle.

A virus that kills its host is said to be