In their experiments to identify the transforming principle, Avery, MacLeod, and McCarty used enzymes that break
down ____.
a. protein, DNA, and RNA
b. protein and RNA only
c. DNA only
d. protein, lipids, and RNA
e. lipids and DNA only
ANSWER: a
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Imagine that you are a biologist attempting to get an accurate measure of an animal's basal metabolic rate. The best time to measure the metabolic rate is when the animal _____
A) is resting and has not eaten its first meal of the day B) is resting and has just completed its first meal of the day C) has recently eaten a sugar-free meal D) has not consumed any water for at least forty-eight hours E) has just completed thirty minutes of vigorous exercise
Many bryophytes have to tolerate desiccation because ___________. (Select all that apply.)
A. they dry out with the environment B. they have little water-storage capacity C. they are restricted to sunny habitats D. they are restricted to saline habitats
__________ is the study of body plans and
structures among groups of organisms. a. Embryology b. Molecular archeology c. Evolution d. Comparative morphology e. Composition
The area indicated by “A” in the figure represents
a. sunlight energy in the environment. b. heat energy in the environment. c. electrical energy in the environment. d. ionizing radiation in the environment. e. the explosion of the hydrogen gas to release energy for the reactions.