Exam 19: Viruses

Viral genomes vary greatly in size and may include from four genes to several hundred genes. Which of the following viral features is most apt to correlate with the size of the genome?

The host range of a virus is determined by

A linear piece of viral DNA of 8 kb can be cut with either of two restriction enzymes (X and Y). These are subjected to electrophoresis and produce the following bands: X Y 5.0 4.5 3.0 2.5 1.0 Cutting the same 8 kb piece with both enzymes together results in bands at 4.0, 2.5, 1.0, and 0.5. Of the possible arrangements of the sites given below, which one is most likely?

In many ways, the regulation of the genes of a particular group of viruses will be similar to the regulation of the host genes. Therefore, which of the following would you expect of the genes of the bacteriophage?

Which of the following characteristics, structures, or processes is common to both bacteria and viruses?

Antiviral drugs that have become useful are usually associated with which of the following properties?

Which treatment would you use to determine if the agent is a prion?

Which of the following statements describes the lysogenic cycle of lambda (λ)phage?

Which of the following accounts for someone who has had a herpesvirus-mediated cold sore or genital sore getting flare-ups for the rest of life?

RNA viruses require their own supply of certain enzymes because

A bacterium is infected with an experimentally constructed bacteriophage composed of the T2 phage protein coat and T4 phage DNA. The new phages produced would have

What is the function of reverse transcriptase in retroviruses?

To cause a human pandemic, the H5N1 avian flu virus would have to

Which of the following is the most probable fate of a newly emerging virus that causes high mortality in its host?

Which of the following molecules make up the viral envelope?

Viral envelopes can best be analyzed with which of the following techniques?

Which of the following terms describes bacteriophage DNA that has become integrated into the host cell chromosome?

Which of the following can be effective in preventing viral infection in humans?

Which of the following represents a difference between viruses and viroids?

Why are viruses referred to as obligate parasites?