When an action potential begins
a. sodium is blocked from leaving the neuron
cytoplasm.
b. sodium is blocked from entering the neuron
cytoplasm.
c. sodium diffuses from the interstitial fluid
into the neuron cytoplasm.
d. sodium diffuses from the neuron cytoplasm
into the interstitial fluid.
e. sodium is actively pumped from the
interstitial fluid into the neuron cytoplasm
C
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The precipitin test that is widely used for detecting antibodies against fungal infection is referred to as:
a. double immunodiffusion. b. counterimmunoelectrophoresis. c. particle agglutination. d. enzyme immunoassay.
This cross is not useful to determine if one of the genes is linked to the others. Which gene?
In peas, tall (T) is dominant to short (t), red flowers (R) is dominant to white flowers (r), and wide leaves (W) is dominant to narrow leaves (w). A tall plant that has red flowers and wide leaves is crossed to a short plant that has white flowers and narrow leaves. The resulting progeny are shown in the table.
A) gene T
B) gene R
C) gene W
D) This cross shows that all three genes are linked.
An antibiotic kills 99.9% of a bacterial population. What will be the result of the continued application of this antibiotic?
A) Every time the antibiotic is given, it will kill 99.9% of the bacterial population. B) Through time, the antibiotic will become less effective at killing the bacteria. C) Eventually, the entire bacterial population will be wiped out. D) The bacterial population will reach an equilibrium point at which the antibiotic is 50% effective.
If after several generations 30 percent of the males have antlers with 9 to 11 points, 40 percent have antlers with 15 to 17 points, and 20 percent have antlers with 12 to 14 points, this development will have been the result of:
A) directional selection. B) disruptive selection. C) stabilizing selection. D) founder effect.