Different responses of the same hormone, or antiestrogen agent, is due to
a. differences in luciferase activity.
b. receptor sites for estrogen.
c. differences in gene amplification.
d. cyclic AMP levels.
e. receptors in the hypothalamus.
B
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The principle of independent assortment states that:
1.One allele is always dominant to another. 2.Hereditary units from the male and female parents are blended in the offspring. 3.The two hereditary units that influence a certain trait segregate during gamete formation. 4.Each hereditary unit on one chromosome is inherited separately from hereditary units on other chromosomes. 5.Genes on the same chromosome travel separately.
On a road trip in the American West, you see a prairie dog town-a colony of related animals. There are hundreds of prairie dogs, but only a subset are scanning for predators at any time. If a predator is spotted, a prairie dog barks to warn the rest of the colony, who dart into their burrows. Prairie dogs have a complex vocabulary of alarm calls, which differ to indicate hawks, coyotes, or humans. What feature of group living is best illustrated by the prairie dog alarm system?
A. reciprocal altruism B. haplodiploidy C. the many-eyes hypothesis D. the geometry of the selfish herd E. optimality theory
Cells that are more active in secreting enzymes would most likely exhibit which one of the following?
a. exocytosis b. endocytosis c. diffusion d. osmosis
Which disorder is characterized by a lack of the protein dystrophin?
A) hemophilia B) color-blindness C) muscular dystrophy D) Down syndrome E) cystic fibrosis