What is the source of a viral envelope?
a) host cell DNA
b) prophages
c) provirus
d) host cell membrane
e) viral glycoproteins
Answer: d) host cell membrane
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DNA methylation is the only known natural modification of DNA. It affects
A. adenine bases. B. guanine bases. C. cytosine bases. D. thymine bases.
The use of oil with certain high-power objective lenses increases
A. magnification. B. the amount of light that enters the objective lens. C. resolution. D. contrast. E. resolution AND the amount of light that enters the objective lens.
The period of time between exposure to an agent and the onset of disease signs and symptoms is called the
A. prodromal phase. B. decline phase. C. incubation period. D. lag phase.
Which of the following molecules forms lengths of DNA with "sticky ends"?
A. restriction enzyme B. DNA ligase C. reverse transcriptase D. DNA polymerase E. RNA polymerase