Which of the following must occur in order to maintain a high pressure potential within guard cells?
A. Energy must be constantly expended.
B. Stomata must take up more oxygen and less carbon dioxide.
C. Water must exit guard cells by osmosis.
D. Potassium ions must be actively transported out.
E. The rate of transpiration must increase.
Answer: A
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A. catabolism. B. anabolism. C. metabolism. D. enzymology. E. thermodynamics.
Which of the following pairs indicates the closest
macroevolutionary link among the bacteria according to the evolutionary history tree in the text? a. green sulfur; spirochetes b. chlamydias; cyanobacteria c. green sulfur; green nonsulfur d. spirochetes; proteobacteria e. proteobacteria; cyanobacteria
Sperm are produced in the
a. testes. b. vas deferens. c. epididymis. d. prostate gland. e. penis.
Which of these types of animals would you expect to find in the deepest rock layers?
A) whales B) fish C) parrots D) frogs