. If a mammalian species that lives in an area with harsh winters and mild springs and summers has a gestation length of five months, when would you expect mating to occur? Assume implantation and pregnancy immediately follow mating.
A. late winter
B. mid-summer
C. late fall
D. early spring
E. mid-spring
C. late fall
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If primary production increases in an ecosystem, it would be reasonable to expect that
A. nutrients would no longer be limiting factors. B. net production would not increase. C. cellular respiration would decrease. D. the trophic web would become more complex. E. the biomass of herbivores would increase.
The myocardium is the
A. sac surrounding the heart. B. layer of endothelial cells lining the wall of the heart. C. artery that carries blood away from the heart. D. artery that carries blood to the heart. E. thick, muscular layer of the wall of the heart.
Symptoms of phenylketonuria (PKU) may be minimized or suppressed by a diet low in
a. serine. b. glycine. c. phenylalanine. d. proline. e. glutamic acid.
Binding of a protein hormone may lead to formation of a __________, which relays a signal into the
cell. Fill in the blank(s) with the appropriate word(s).