Dana Reeve, the wife of actor Christopher Reeve, died at a young age from lung cancer, although she had never smoked. Her cancer was likely caused by
A) a germline mutation.
B) two somatic mutations in the same lung cell.
C) exposure to carcinogens.
D) stress from caring for her husband, who had a spinal cord injury.
A) a germline mutation.
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Which of the following is not true of enzyme behavior?
1.Enzyme shape may change during catalysis. 2.Enzymes cannot make something happen that would not happen on its own. 3.All enzymes have an active site where substrates are temporarily bound. 4.Each enzyme can catalyze a wide variety of different reactions. 5.Enzymes speed up reactions.
How are simple diffusion and facilitated diffusion similar to each other?
a. They both belong to active transport. b. They both transport through the aid of a transport molecule. c. They both require energy. d. They both belong to passive transport.
Epidemiologists can use (direct immunofluorescent/immunochromatographic/serological) assays to track infectious disease.
Fill in the blank(s) with the appropriate word(s).
Which of the following illustrates the free-rider problem?
a. By reliably reciprocating a cooperative behavior, all individuals in the population increase their fitness. b. Some daughters forego having offspring of their own as they help their mother with brood care. c. An individual spends only half an hour grooming others for each hour of grooming it has re-ceived. d. Some individuals forgo reproduction to avoid overpopulation of a species' habitat.