Species that live in different habitats exhibit ____ reproductive isolation
a. temporal
b. behavioral
c. gametic
d. ecological
e. mechanical
ANSWER: d
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In temperate lakes, the surface water is replenished with nutrients during turnovers that occur in the _____
A) autumn and spring B) autumn and winter C) spring and summer D) summer and winter E) summer and autumn
Which is a structural feature shared by DNA, RNA, and proteins?
A) The order of monomers is important for function. B) Each sequence of monomers folds into a different three-dimensional shape. C) Each molecule is a polymer of four different nucleotides. D) Two strands of monomers are connected by hydrogen bonding.
All the following are plant adaptations to low temperatures, except
A) shedding leaves at the onset of cold weather. B) production of antifreeze molecules. C) a shifting of Topt. D) increased photosynthetic rate to heat leaves.
Why do pseudogenes evolve so much more quickly than other genes?
A. High rates of recombination in pseudogenes are often subject to unequal crossing over. B. Pseudogenes are processed more quickly because there are no enzymes present to check for replication errors. C. Transposable elements target pseudogenes as a site of insertion. D. They are not subject to purifying selection because mutations have no functional consequence. E. Directional selection causes rapid change in their sequence.