The probability of producing a normal child by
two parents who are carriers for an autosomal
recessive disorder is
a. 0%.
b. 25%.
c. 50%.
d. 75%.
e. 100%.
D
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A life table
a. is used extensively by the insurance industry. b. can be used to determine the exact year of death for an individual. c. for humans does not take into account deaths from accidents. d. has no predictive value. e. determines the maximum age a human can reach.
A gene that produces a protein that is important in more than one biochemical pathway, or other trait, is a ___ gene. Select one:
a. pleiotropic b. recessive c. codominant d. incomplete dominant e. dominant
Which statement best describes the mechanism of neutralization?
A) Antigens clump together and are more susceptible to phagocytosis. B) Cells are neutralized by toxins injected by natural killer cells. C) It causes pathogenic cells to lyse. D) An antibody blocks an antigen's activity by binding to it. E) Pathogens are bound by antibodies and are more susceptible to phagocytosis.
Each trophic level represents approximately a _____ percent energy ___
A. 10; loss B. 90; transfer C. 50: loss D. 90; loss