The macrolide erythromycin works by
A) Inhibiting the binding of aminoacyl-tRNA molecules to the A site of ribosomes
B) Binding to the small ribosomal subunit to interfere with protein synthesis
C) Inhibiting peptide chain elongation during protein synthesis
D) Inhibiting the peptidyl transferase reaction
Ans: C) Inhibiting peptide chain elongation during protein synthesis
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The oxygen content of water increases linearly with an increase in oxygen partial pressure, while the oxygen content of blood increases in a sigmoidal (S-shaped) fashion. Why?
A) Carbonic anhydrase contributes to carbon dioxide release in blood, but not water. B) The Bohr shift is stronger in water than in blood. C) Hemoglobin shows cooperative oxygen binding. D) Oxygen is transported equally by hemoglobin and blood plasma.
When planting seeds, why should you plant more seeds than you expect to grow?
a. Animals may eat some seeds. b. Some seeds may not germinate. c. The wind may disperse some seeds to an unsuitable environment. d. all of these
Duplicated centrioles move to opposite poles of a dividing ____ cell during the ____ of the cell cycle
a. plant; metaphase b. plant; anaphase c. prokaryotic; metaphase d. animal; interphase e. animal; prophase
A bony skeleton, an operculum, and a swim bladder would be found in which group?
a) reptiles b) sharks c) amphibians d) ray-finned fishes e) mammals