Which of the following enzymes is responsible for transcribing viral RNA into DNA?
A) RNA polymerase
B) reverse transcriptase
C) DNA polymerase
D) reverse integrase
E) RNA duplicase
B
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Which of the following is characteristic of steroid hormones?
a. They are derived from peptides or proteins. b. They influence the activity of DNA. c. They interact with receptors on the exterior surface of the cell membrane. d. They utilize second messenger systems to produce target tissue actions. e. They produce cAMP molecules in target tissue.
One of the most common organisms used to produce knockouts is ________
A) cows B) horses C) mice D) Drosophila E) All of the above
Mature sperm function best
A) at temperatures slightly warmer than body temperature. B) at temperatures slightly cooler than body temperature. C) when high concentrations of glucose are available as an energy source. D) when the pH of semen is below 6.0. E) when the pH of semen is above 8.2.
If a human female has 2 Barr bodies per cell, it is almost certain that
A. her father had 1 Barr body per cell. B. her mother also had 2 Barr bodies per cell. C. she is genetically a normal fertile female. D. she is genetically a male with female characteristics. E. she developed from a fertilized egg with 3 X chromosomes.