Mutations in opsin proteins in the cones will lead to ____
a. difficulty seeing at night
b. colorblindness
c. complete blindness
d. tunnel vision
e. cortical blindness
ANSWER: b
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Phospholipids and ________ are the major components of cell membranes.
A. glycolipids B. cholesterol C. glucose transporters D. glycocalyx E. proteins
Atmospheric levels of carbon dioxide have rapidly increased since the industrial revolution. One effect of increased atmospheric CO2 is global warming. What effect does increased CO2 have on plants?
A. plants may no longer need light for photosynthesis. B. some crops such as tomatoes and cucumbers may experienced enhanced growth rates. C. plants may be able to absorb carbon dioxide even with their stomata closed. D. C4 photosynthesis may become more important than C3 photosynthesis.
An animal with bilateral symmetry
a. has left and right sides. b. usually displays cephalization. c. produces mirror images regardless of the number of "cuts" through the central axis. d. has left and right sides and usually displays cephalization. e. has left and right sides, usually displays cephalization, and produces mirror images regardless of the number of "cuts" through the central axis.
Implantation occurs approximately
a. one day after fertilization. b. three days after fertilization. c. one week after fertilization. d. two weeks after fertilization. e. one month after fertilization.