Which of the following vitamin deficiencies results in rickets?
a. vitamin A
b. vitamin E
c. vitamin D
d. vitamin K
c. vitamin D
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Non–acid-fast aerobic actinomycetes include:
a. Nocardia. b. Rhodococcus. c. Streptomyces. d. Gordona.
Which of the following did not play a role in the eradication of smallpox?
A. Ease of diagnosis by readily recognized clinical features B. A short period of infectivity C. No known reservoir outside of human hosts D. The availability of effective antiviral agents that block replication E. All of these characteristics played a role in the eradication of smallpox
The most important advantage of sexual
reproduction is related to
a. increased production of offspring. b. avoiding predators. c. avoiding harmful mutations. d. producing offspring identical to the parents. e. the advantage of having two sexes
Alcohol has diuretic effects, increasing urine output. By which one of the following is this mediated?
A) Alcohol increases the amount of sodium reabsorbed. B) Alcohol decreases the amount of sodium reabsorbed. C) Alcohol makes the renal tubules more permeable to water. D) Alcohol inhibits the release of ADH. E) Drinks with alcohol also contain a lot of water, and the kidneys excrete this.