After several years of drought, the beak sizes of the medium ground finches were on average, larger than they had been in previous generations. What kind of natural selection occurred?
a) sexual
b) disruptive
c) balancing
d) directional
Answer: d) directional
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What protein does DNA wrap around when condensing during cell division?
a. helicase b. histone c. ligase d. polymerase
What characterizes a thermocline in a temperate zone lake?
1.The layer above it is warm and has lots of oxygen. 2.The layer below it contains the warmest water. 3.It occurs in the spring as the air warms and ice melts. 4.It is very rich in oxygen.
Each of the following citric acid cycle enzymes catalyzes electron transfer to NADH/FADH2 except
A) isocitrate dehydrogenase. B) ?-ketoglutarate dehydrogenase. C) succinyl CoA synthetase. D) succinate dehydrogenase. E) malate dehydrogenase.
The ________ represents the sporophyte generation of a conifer, and the ________ produces gametophytes
A) cone; tree B) tree; cone C) tree; pollen D) seed; tree