It is a fact that enzymes are highly specific and will only catalyze one or a few reactions. Can you think of a benefit
that is derived from such specificity? (i.e., What would happen if most biochemical reactions were catalyzed by the same
enzyme?) What will be an ideal response?
Concepts to Consider: Having specific enzymes allows the cell to control and regulate the
biochemical reactions within it; if only one enzyme were responsible for all catalysis within a
cell, then all reactions would proceed simultaneously, which is unacceptable.
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This animal has the fewest genes, the simplest
body plan, and only four cell types. It is a
a. planarian. b. placozoan. c. annelid. d. roundworm. e. sponge
The structure of a DNA molecule is analogous
to a
a. paper clip. b. ladder. c. fork. d. rope. e. coiled spring
To communicate across hundreds of miles, whales use
A) pheromones. B) sight. C) wave motions. D) sound. E) touch.
A plant cell in a hypotonic solution
A) becomes turgid because of an inflow of water. B) bursts because of an inflow of water. C) shrivels because of an outflow of water. D) wilts because of an outflow of water.