Which structure becomes part of the placenta?
a. chorion
b. amnion
c. blastocoel
d. yolk sac
e. allantois
ANSWER: a
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The carotid and aortic bodies stimulate respiratory activity ____
a. when oxygen levels in the blood fall relative to carbon dioxide b. when carbon dioxide levels in the blood fall c. when plasma pH becomes more basic d. when the lungs are stretched beyond normal e. during exercise
Body cells that respond to insulin include
A) Liver cells, as well as most other cells of the body. B) Liver cells and muscle cells only. C) Intestinal cells only. D) Muscle cells only. E) Liver cells only.
Adaptive behavior has probably been selected by evolutionary processes because it
A. allows the animal to produce the largest number of viable offspring. B. allows the animal to live in the widest variety of environments. C. makes the animal the smartest. D. allows the animal to live the longest. E. All of the choices are correct.
What is the role of the apical complex in apicomplexans?
A. The apical complex is a defensive structure that is used to destroy bacteria. B. The apical complex enables the apicomplexan to penetrate and bore into a host cell. C. The apical complex is a motility structure that enables cell movement. D. The apical complex is a feeding structure through which small food particles are taken in.