Which of the following methods is the most effective as birth control?
a. condoms
b. diaphragms
c. abstinence
d. oral contraceptives
e. vasectomy
C
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Mutations are likely to persist after SOS repair, but not after light-induced or excision repair
Indicate whether this statement is true or false.
An oncogene is
a. a normal gene that promotes mitosis. b. a gene that codes for a growth factor that stimulates cell division. c. a gene that codes for tumor suppressing proteins. d. a mutated gene that results in tumors. e. more than one of these
Which statement is false concerning MacConkey agar?
A. It contains lactose B. Crystal violet prevents gram positive bacteria from growing on it C. It is also called Levine agar D. It contains a pH indicator
Which of the following statements most accurately describes the expression of the repressor protein of the tryptophan operon?
a. The gene for the tryptophan repressor is turned on in response to high levels of tryptophan in the cell. b. The gene for the tryptophan repressor is turned off in response to high levels of tryptophan in the cell. c. The gene for the tryptophan repressor is turned on in response to low levels of tryptophan in the cell. d. The gene for the tryptophan repressor is turned off in response to low levels of tryptophan in the cell. e. The gene for the tryptophan repressor is expressed constitutively.