Which of the following characteristics, structures, or processes is common to both bacteria and viruses?a. metabolismb. ribosomesc. genetic material composed of nucleic acidd. cell division

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 __________.

What do host cells provide for viruses?a. ATPb. nucleotides and amino acidsc. ribosomesd. all of the above

What does reverse transcriptase do?

Emerging viruses arise bya. mutation of existing viruses.b. the spread of existing viruses to new host species.c. the spread of existing viruses more widely within their host species.d. all of the above.

In the viral replicative cycle, what reaction do viral proteases catalyze? Select True or False for each statement.T/F They catalyze polymerization of amino acids into peptides.T/F They catalyze folding of long peptide chains into functional proteins.T/F They catalyze cutting of polyprotein chains into functional proteins.T/F They catalyze breaking of peptide bonds

To cause a human pandemic, the H5N1 avian flu virus would have toa. spread to primates such as chimpanzees.b. develop into a virus with a different host range.c. become capable of human-to-human transmission.d. become much more pathogenic.