Nondisjunction of chromosomes during
meiosis can lead to
a. directional selection.
b. disruptive selection.
c. sympatric speciation.
d. hybrid sterility.
e. allopatric speciation
C
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In the example of the giant kelp forests on the Pacific coast, a rise in the otter population would have what effect on the kelp populations?
A. Kelp populations would decrease due to increased predation by otters. B. Kelp populations would increase due to an increase in sea urchins. C. Kelp populations would decrease due to an increase in sea urchins. D. Kelp populations would increase due to a decrease in sea urchins. E. Kelp populations would be totally unaffected by the otter population.
One of the major differences between plants and animals with regard to oxygen is that
__________.
a. plants do not require oxygen b. animals produce oxygen c. plants produce oxygen d. plants use oxygen to generate energy
Events X and Y are independent of each other. If the probability of event X occurring is 1 in 4, and the probability of
event Y occurring is 1 in 5, the probability of both events occurring is ____.
a. (1/4)2 + (1/5)2 = (1/16) + (1/25) = (25/400) + (16/400) = 41/400 b. (1/4) + (1/5) = (5/20) + (4/20) = 9/20 c. (1/4)2(1/5)2 = (1/16)(1/25) = 1/400 d. (1/4)(1/5) = 1/20 e. (1/4 + 1/5)2 = (5/20 + 4/20)2 = (9/20)2 = 81/400
Helical and icosahedral are terms used to describe the shape of a viral ________.
A. capsomere B. envelope C. spike D. core E. capsid