What can result from burning fossil fuels?
A) a decrease in ground-level ozone levels
B) a decrease in carbon dioxide levels
C) an increase in mercury levels
D) a decrease in acid rain
C
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Arrange the three lines of defense from the first to the last
1 = Adaptive immune system 2 = Physical barriers 3 = Innate immune system
a. 1, 2, 3 b. 2, 1, 3 c. 2, 3, 1 d. 3, 1, 2 e. 3, 2, 1
A gene can be silenced by the addition of what to a nucleotide?
a. -CH3 b. -COOH c. -OH d. -NH2 e. -PO4-3
Refer to Figure 13-3. The component labeled B is:
a. DNase.
b. DNA polymerase.
c. RNA primase.
d. RNA polymerase.
e. reverse transcriptase
Some insecticides interfere with the removal of acetylcholine from the synaptic cleft. What effect will this have on muscle contraction?
A) The muscle cell will lose all of its supply of calcium. B) The muscle cell will be unable to be stimulated again. C) The muscle cell will be in a state of constant stimulation, leading to a tetany response. D) The muscle cell will have a single twitch and will be unable to contract again.