Which of the following proteins of the human immunodeficiency virus (HIV) is used to synthesize viral DNA?
A. RT (reverse transcriptase)
B. SU (surface)
C. CA (capsid)
D. TM (transmembrane)
E. MA (matrix)
Answer: A. RT (reverse transcriptase)
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In the systemic arteries, the partial pressure of oxygen is approximately ________, and hemoglobin is approximately ________ saturated with oxygen.
A) 40 mm Hg : 75% B) 100 mm Hg : 75% C) 60 mm Hg : 50% D) 40 mm Hg : 50% E) 100 mm Hg : 98%
The phenotype of vestigial (short) wings (vg) in Drosophila melanogaster is caused by a recessive mutant gene that independently assorts with a recessive gene for hairy (h) body. Assume that a cross is made between a fly with normal wings and a hairy
body and a fly with vestigial wings and normal body hair. The wild-type F1 flies were crossed among each other to produce 1024 offspring. Which phenotypes would you expect among the 1024 offspring, and how many of each phenotype would you expect? A) Phenotypes: wild, vestigial, hairy, and vestigial hairy; Numbers expected: wild (192), vestigial (256), hairy (64), and vestigial hairy (192). B) Phenotypes: wild, vestigial, hairy, and vestigial hairy; Numbers expected: wild (576), vestigial (192), hairy (192), and vestigial hairy (64). C) All wild type. D) All vestigial hairy. E) Phenotypes: wild, vestigial, hairy, and vestigial hairy; Numbers expected: wild (256), vestigial (256), hairy (256), and vestigial hairy (256).
What might be a result of hunting sea otters to extinction for their fur?
A) loss of killer whales B) loss of sea urchins C) loss of kelp beds D) loss of barnacles
Which statement best describes the activity of the sodium-potassium pump?
a. It transports hydrogen ions out of the cell. b. It transports water directly out of the cell. c. It transports 2 sodium ions into the cell in exchange for 3 potassium ions. d. It transports 3 sodium ions out of the cell in exchange for 2 potassium ions. e. It transports 2 sodium ions out of the cell in exchange for 2 potassium ions.