The occurrence of an RNA world early in the history of life can never be proven, but experiments with _____ have
shown that it is feasible.
a. in vitro evolution
b. Darwin’s evolution
c. indirected evolution
d. chemical evolution
e. biological evolution
ANSWER: a
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When primary producers expend energy to build new tissue, this is _____
A) net primary productivity B) the amount of energy available to consumers C) maintenance costs D) net primary productivity and the amount of energy available to consumers E) maintenance costs and the amount of energy available to consumers
While studying for an anatomy exam, some of your fellow students are having difficulty locating the clitoris. Where would you tell them to find it?
a. equidistant from the urethra and the cervix b. contained within the medulla of the ovary c. ventral to the vagina, between the labia majora d. within the upper region of Utopia Planitia
The first pathway of photosynthesis was
a. the cyclic pathway. b. the noncyclic pathway. c. similar to anaerobic respiration. d. similar to aerobic respiration. e. based on the fermentation pathway.
Which is NOT a mechanism of horizontal gene transfer (HGT)?
a. transduction b. transposition c. transformation d. Neither transduction nor transposition are HGT.