When a population is in a neutral equilibrium, a small change causes the population to:
a. return to its starting position.
b. move farther away from its starting point.
c. remains at its displaced position.
d. A and B.
e. A and C.
C
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The rate at which evolution is occurring cannot be estimated by:
A. inferring that apes are related to humans. B. studying comparative anatomy. C. interpretation of the fossil record. D. measuring the degree of difference in genetic coding.
The total number of protons and neutrons of an element establishes its ________ number.
Fill in the blank(s) with the appropriate word(s).
Pyruvate is an important metabolic intermediate that can be converted into several other compounds, depending on which enzyme is catalyzing the reaction. Which of the following cannot be produced from pyruvate in a single enzyme-catalyzed reaction?
(a) lactate (b) oxaloacetate (c) citrate (d) alanine
Which of the following characteristics is not shared by typical birds and mammals?
a. four-chambered heart b. milk production c. four limbs d. endothermy e. insulating skin structures