In the lac operon, the protein that binds to the operator to prevent transcription is

A. RNA polymerase.
B. lactose.
C. DNA polymerase.
D. the repressor.
E. the promoter.


D. the repressor.

Biology & Microbiology

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Which of the following structures is NOT a

part of a carpel?

a. stigma b. style c. calyx d. ovary e. all of these are parts of a carpel

Biology & Microbiology

Four of the five fertility control methods listed below

are related by similar effectiveness. Select the exception. a. the Pill b. tubal ligation c. vasectomy d. douching e. IUD

Biology & Microbiology

How many differentiated cell types exist in an adult?

a. 50 b. 100 c. 150 d. 200 e. it varies from person to person

Biology & Microbiology

The transition between figure A and figure B in Figure 19-1 is NOT characteristic of:


a. extreme changes in the environment.
b. genetic variation.
c. disruptive selection.
d. natural selection.
e. stabilizing selection.

Biology & Microbiology