Which RNA acts as an enzyme?
a. mRNA
b. rRNA
c. tRNA
d. mRNA and rRNA
e. rRNA and tRNA
ANSWER: b
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Imagine that you have two people using breathing gear under water. Diver 1 is using an old style "rebreather" that removes carbon dioxide before the mixture is "rebreathed" and therefore decreases overall carbon dioxide concentrations in the blood. Diver 2 is using regular SCUBA gear and is breathing air with the normal amount of carbon dioxide that does not lower blood levels of carbon dioxide. Which diver would have a higher blood pH and which would feel more an "urge to breathe"?
A. Diver 1 would have higher blood pH and would feel the "urge to breathe" sooner. B. Diver 2 would have higher blood pH and feel the "urge to breathe" sooner. C. Diver 1 would have higher blood pH, while Diver 2 would feel the "urge to breathe" sooner. D. Diver 2 would have higher blood pH, while Diver 1 would feel the "urge to breathe" sooner. E. There would be no difference in blood pH or breathing between the two divers.
The neutral theory of molecular evolution, as developed by Kimura, posits that ________
A) functionally neutral mutations that become fixed in populations occur in much larger numbers than those that become fixed by natural selection B) functionally neutral mutations never become fixed in populations without some element of selection also acting on them C) functionally neutral mutations are not subject to genetic drift D) functionally neutral mutations contribute very little to changes at the molecular level
The bases in DNA are complementary. A always binds with
A. G. B. T. C. C. D. A. E. U.
In response to larval insect grazing, some plants produce substances known as precocenes, which destroy the part of the insect brain that secretes juvenile hormone. What effect would exposure to precocenes have on insect development?
A. The larval insect would molt into an adult prematurely. B. The larval insect would not be able to produce ecdysone. C. The larval insect would molt into larger and larger larval stages. D. The larval insect would not be able to molt. E. The time interval between successive molts would increase.