The differences in evolutionary rates of change revealed by relative rate tests may be attributable to
A) differential strength of selection.
B) generation time.
C) average DNA repair efficiency.
D) differential exposure to mutagens.
E) All of these
E
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Which biomolecule is most associated with the structure and function of cell membranes?
a. Polysaccharides b. steroids c. DNA d. phospholipids e. ATP
The osculum of a sponge is entirely blocked by a fungal infection. Predict what will happen.
A. Water will be unable to enter the sponge. B. Choanocytes will no longer be able to function. C. Digestion will be prevented from occurring. D. The flow of water out of the sponge will decrease.
Which of the following represents a synthesis reaction?
A. A + B ? AB B. AB ? A + B C. AB + XY ? AY + XB D. AB + XY ? AY + XB
In which situation is the detrital food chain not more dominant than the grazing food chain?
A) open-water aquatic ecosystems B) kelp forest ecosystems C) grassland ecosystems D) tropical forest ecosystems