USABO Open Questions with Complete Solutions What enzyme does HIV use to convert RNA to DNA?[ ] A. DNA gyrase [ ] B. RNA polymerase [ ] C. Reverse transcriptase [ ] D. DNA helicase - Correct Answers ✅C Which of the following is TRUE of prokaryotes?
- Simultaneous transcription and translation
II. Presence of intron sequences III. Circular DNA
[ ] A. I and II only [ ] B. I and III only [ ] C. II and III only [ ] D. I, II, and III - Correct Answers ✅B The promoter region of a prokaryotic gene is located ______ to the gene and is the binding site for ______.[ ] A. 3'...DNA polymerase [ ] B. 3'...RNA polymerase [ ] C. 5'...DNA polymerase [ ] D. 5'...RNA polymerase - Correct Answers ✅D 1 / 2
USABO Open Questions with Complete Solutions . Integral transmembrane proteins are proteins imbedded in the cell membrane. Which of the following amino acids would you MOST expect to find in the transmembrane region of such proteins?[ ] A. Lysine [ ] B. Serine [ ] C. Tryptophan [ ] D. Arginine - Correct Answers ✅C Tryptophan (it is non polar and does not have a charge) The frequency of individuals affected with an autosomally recessive inherited disorder is 1 in 4. Assuming that the population affected by this disease is in Hardy-Weinberg equilibrium, what is the proportion of carrier individuals in this population?
[ ] A. 12.5%
[ ] B. 25%
[ ] C. 50%
[ ] D. 100% - Correct Answers ✅C 50% The velocity of action potential conduction across a nerve axon is increased by the presence of the myelin sheath. In the peripheral nervous system, what cell myelinates the axon?[ ] A. Oligodendocyte
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