During mating in frogs, the male clasps the female tightly around the body with his forelimbs. This is
termed
a. amplexus.
b. fertilization.
c. copulation.
d. fusion.
e. marriage.
A
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Which digestive structure in humans is active in both the digestion of food and the absorption of
nutrients?
a. mouth b. liver c. pancreas d. small intestine e. stomach
Figure 14.3
Which of the following is the genetic condition observed in the woman on the left in the above figure?
A. Huntington's disease B. Achondroplasia C. Triple recessive condition D. Galactosemia E. Muscular dystrophies
A primitive streak forms during the early embryonic development of
A) birds, but not frogs or humans. B) frogs, but not birds or humans. C) humans, but not birds or frogs. D) birds and frogs, but not humans. E) humans and birds, but not frogs.
How does heat affect a DNA duplex? It causes:
a. the two strands to anneal. b. double-stranded breaks. c. denaturation. d. hybridization. e. mutations.