In most animals, fertilization concludes with
a. the fusion of egg and sperm nuclei.
b. meiosis II of the first polar body.
c. meiosis II of the oocyte.
d. sperm penetration of the oocyte.
e. release of digestive enzymes by the sperm
acrosome.
Answer: a
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What is gross primary production?
A. The carbon fixed during photosynthesis. B. All of the carbon fixation after cellular respiration is accounted for. C. Energy released by both primary and secondary consumers. D. Photosynthetic production plus energy recycled through detritivores. E. None of the answers is correct.
When one muscle group is stimulated, no nervous signals are sent to the opposing group. This is the
result of a. reciprocal innervation. b. lack of innervation. c. hyperreflexia. d. compensation. e. depolarization.
The capillary wall consists of
a. a thin muscular layer and two layers of endothelial cells. b. a single layer of flat endothelium. c. a layer of endothelium, a layer of muscle and a layer of epithelium. d. five layers of endothelium. e. three endothelial layers and one layer of muscle.
AgNO3 + NaCl ® AgCl + NaNO3. The AgNO3 in the equation is called a(n)
A. reactant. B. acid. C. product. D. base.