In humans, male-pattern baldness is controlled by a gene that occurs in two allelic forms. Allele Hn determines nonbaldness, and allele Hb determines pattern baldness. In males, because of the presence of testosterone, allele Hb is dominant over Hn. If a man and woman both with genotype HnHb have a son, what is the chance that he will eventually be bald?
A) 0%
B) 25%
C) 33%
D) 50%
E) 75%
Answer: E) 75%
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A. blockers B. inhibitors C. competitive inhibitors D. noncompetitive inhibitors
In atherosclerosis,
a. the lumen of the artery is narrowed b. the arterial walls fill with fibrous connective tissue. c. lipids in the bloodstream become embedded in the walls of the endothelial lining. d. a fibrous net covers the entire abnormal area. e. all of these occur.
Which are nursery grounds for many invertebrates
and fish? a. photic zones b. benthic zones c. estuaries d. pelagic zones e. limnetic areas
Which of the following is NOT a characteristic of the sponges?
A. Sponges have an osculum, an opening in the upper body. B. Sponges can reproduce sexually or asexually. C. Sponges have three tissue layers. D. If the cells of a sponge are mechanically separated, they will spontaneously reassemble into a complete and functioning sponge. E. Sponges are filter feeders.