The idea that geologic processes have formed the
earth’s surface by repeating the same actions over
and over is known as
172 Test Bank
a. the theory of catastrophism.
b. plate tectonics.
c. continental drift.
d. the theory of uniformity.
e. the theory of relativity.
Answer: d
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Which type(s) of mutation might lead to a threonine auxotrophic revertant?
A. Base substitution B. Missense mutation C. Point mutation D. All of the choices are correct.
Which of the following is true for a nerve cell at rest?
A. Channels allow for the movement of potassium out of the cell. B. Sodium ions are concentrated outside the cell. C. Channels allow for the movement of chloride into the cell. D. Channels allow for the movement of potassium out of the cell AND sodium ions are concentrated outside the cell.
Which of the following is not an active form of an enzyme?
1.trypsin 2.amylase 3.pepsin 4.pepsinogen 5.chymotrypsin
Threadlike bits of protein attached to the inner surface of the nuclear envelope serve to
a. assist in molecular transport through the membrane. b. help the cell move c. aid in passage of ribosomes out of the nucleus d. anchor DNA molecules to the envelope and keep them organized. e. Stabilize the nuclear envelope.