A U.S. submarine surfaced ____ miles from
the nearest land in the arctic and found polar
bears hunting on the frozen sea.
a. 100
b. 1,000
c. 500
d. 50,000
e. none of these
C
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Which of the following would work as an antidote for someone who was bitten by a black
widow spider?
a. a drug that blocks the sodium–potassium pump b. a drug that causes potassium gates to open c. a drug that blocks acetylcholine binding sites d. a drug that stimulates the release of calcium
Which statement best describes parasitism?
a. A parasite is harmful to the host. b. A parasite provides nutrients for the host. c. A parasite does not harm the host. d. A parasite does not receive any benefits from the host. e. A parasite always kills its host.
What is the substance produced by bark that repels water?
a. pith b. lignin c. suberin d. cortex
How are B-cell receptors different from T-cell receptors?
a. B-cell receptors bind antigen, while T-cell receptors do not. b. B-cell receptors have a more complex structure. c. B-cell receptors have a more simple structure. d. B-cell receptors are bound to the cell membrane, while T-cell receptors are bound to the nuclear membrane. e. B-cell receptors stimulate the production of a clone of cells.