Which type of signaling is blocked by the toxin, curare?
A. juxtacrine
B. paracrine
C. autocrine
D. endocrine
B
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Why is it critical that the K+ channel activation gate responds slightly more slowly to depolarization than the Na+ channel activation gate?
A. If they showed identical response times, movements of Na+ and K+ ions would cancel out each other's effects on membrane potential changes. B. If they showed identical response times, movements of Na+ and K+ ions would magnify each other's effects on membrane potential changes, creating dangerously large action potentials. C. It is not critical and there would be no change in action potential characteristics if this difference in response time did not exist.
Kanisha and her friend both receive their grades for their physics midterms. Kanisha got an A, but her friend received a D. "You must have the physics gene," remarks her friend. "I don't. I might as well not bother studying." The friend's attitude illustrates the idea of
A) genetic discrimination. B) genetic determinism. C) genetic engineering. D) genetic modification.
Which of the following protists causes a sexually transmitted disease that can result in infertility?
a. Trichomonas vaginalis b. Trypanosoma cruzi c. Giardia lamblia d. Euglena gracilis
Which of these humans is the "fittest" as far as natural selection is concerned?
A) a person who lives to the age of 105 and has two children B) a very popular film star who is still alive, is very rich, and has three children from three spouses C) a person who lives to the age of 110 and has no children D) a person with seven children who is killed in an automobile accident at age 40