How is the NO pathway manipulated by Viagra to treat erectile dysfunction?
a. NO synthesis is decreased
b. NO synthesis is increased
c. the enzyme catalyzed by NO is stabilized
d. the enzyme catalyzed by NO is inhibited
e. the breakdown of cGMP is inhibited
ANSWER: e
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Which of the following statements is incorrect concerning the use of drug therapy in an HIV-positive patient?
A) If drug therapy is used in a confirmed HIV-positive patient, all HIV viruses can be successfully eliminated from the body. B) Protease inhibitors can slow the assembly of new viruses. C) Reverse transcriptase inhibitors can help to slow the virus from entering into host chromosomes. D) Two or more drugs can be combined to form a "drug cocktail."
Based on the endosymbiosis theory that highlights where chloroplasts come from, how would you expect chloroplasts to divide when a plant cell divides?
A) Via mitosis B) Via meiosis C) Via binary fission D) Via endosymbiosis
Mendel began his experiments with purebred pea plants. This approach enabled him to determine that variations among offspring were the result of
A.) random mutations B.) self-pollination C.) genetic uniformity D.) his crossings
In mammals, where is the glomerulus located?
a. within the distal convoluted tubule b. within the ascending segment of the loop of Henle c. within the Bowman's capsule d. within the descending segment of the loop of Henle