Plant growth and development is guided by
a. hormones.
b. other signaling molecules.
c. water availability.
d. day length.
e. all of these.
Answer: e
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In itself, a flood that washes away an entire population of rabbits is
a. a density-dependent factor. b. a limiting factor dependent on the individuals. c. a consequence of exponential growth. d. density-independent. e. a result of natural selection.
Which molecules pick up and transfer H+ to the electron transport chain?
a. ATP b. oxygen c. phosphate d. acetyl-CoA e. NAD and FAD
During a baseball game a batter ducks to avoid a wild pitch. In this situation, the ____ is the stimulus and ____ is the response.
A. pitcher; the batter B. pitcher; wild pitch C. ducking; wild pitch D. wild pitch; ducking
Why is the phospholipid bilayer considered semipermeable?
A. The hydrophobic tails act as a barrier to nonpolar molecules. B. The bilayer is a barrier to some, but not all, substances on either side of it. C. Large molecules can only pass through the layer of hydrophilic phospholipids. D. The bilayer is completely nonpolar, which prevents some molecules from passing. E. Small, nonpolar molecules do not pass through the phospholipid bilayer.