17. Viruses

Birds act as a natural __________ for the influenza __________ virus.

A phage that inserts itself into the host DNA is called __________.

A prophage is a(n) __________.

In the lysogenic cycle of phages, __________.

What is the origin of the phospholipid membrane that envelops many animal viruses?

What is the function of hemagglutinin in the influenza virus?

Why can flare-ups of herpesvirus infection recur throughout a person's life?

How do retroviruses, such as HIV, differ from other viruses?

Emerging viruses can originate from which of the following sources?

Reverse transcription, carried out by retroviruses, is the process by which __________.

Which statement below is a correct comparison of a "regular" RNA virus and an RNA retrovirus?

When comparing DNA and RNA viruses, which mutate more quickly, and why?

The symptoms of a viral infection in a person can be caused by __________.

Vaccines for viral diseases are __________ and help prevent infection by __________.

Prions are __________ that are thought to cause disease by __________.