The cells that surround each stoma and control its opening and closing are
A. sieve tube cells.
B. vascular cells.
C. companion cells.
D. pith cells.
E. guard cells.
Answer: E. guard cells.
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What behavior did Eric Kandel and his colleagues focus on in their studies of learning in Aplysia?
A. the gill-withdrawal reflex B. feeding C. sexual behavior D. locomotion E. aggression
In the pelagic province of the open ocean ________ and ________ are the primary producers
a. algae, bacteria b. fungi, bacteria c. corals, algae d. corals, bacteria e. sea grasses, algae
Calvin cycle The Calvin cycle
a) is a cyclic pathway that produces three-carbon carbohydrates from CO2. b) is a linear pathway that produces three-carbon carbohydrates from CO2. c) is a cyclic pathway that produces ATP and NADPH. d) is a linear pathway that produces ATP and NADPH.
Urinary tract infections with ________ are frequently complicated by the formation of kidney stones.
A. Escherichia coli B. Bacteroides species C. Proteus mirabilis D. Klebsiella pneumoniae E. Salmonella species