HIV is classified as a retrovirus because
A) it infects only cells with a CD4 receptor.
B) it makes a DNA copy of its RNA once inside the host cell.
C) this virus is composed of two cells surrounded by a lipoprotein coat.
D) it reverts to an inactive form when it infects B lymphocytes.
E) it causes the production of HIV antibodies.
B
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The process that discriminates between phenotypes with respect to their ability to produce offspring is known as
(a) natural selection. (b) gene flow. (c) genetic drift. (d) migration.
Sickle-cell anemia is a human disease that occurs as a result of what type of mutation in the b-globin gene?
A. silent B. missense C. nonsense D. frameshift E. sense
Most peptic ulcers are caused by ____
a. antibiotics b. bacteria c. heartburn d. lactose intolerance e. malnutrition
The scissors in the figure represent
a. restriction enzymes. b. reverse transcriptases. c. DNA polymerases. d. RNA polymerases. e. DNA ligases