What plants have been significantly altered by humans through artificial selection?
A. maize
B. rice
C. wheat
D. acorns
E. Virginia creeper
Answer: C
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Which regulatory mechanism is important in keeping glycolysis and the citric acid cycle in relative balance to each other?
A. Citrate inhibits phosphofructokinase 1. B. ADP up-regulates phosphofructokinase 1. C. ATP inhibits phosphofructokinase 1. D. AMP inhibits phosphofructokinase 1.
Chthamalus stellatus and Semibalanus balanoides do not coexist in the same tidal zones because
A. S. balanoides outcompetes C. stellatus. B. C. stellatus outcompetes S. balanoides. C. S. balanoides preys on C. stellatus. D. The two species require different resources.
The intercellular spaces between plant cells
a. contain air. b. are responsible for cytoplasmic streaming. c. produce energy for the cell. d. contain chloroplasts.
The polymerase chain reaction (PCR) uses ________
and a heat-resistant DNA polymerase to rapidly increase the number of molecules of a DNA fragment. Fill in the blank(s) with the appropriate word(s).