Jacob, Monod, and Pardee constructed a mutant strain of E. coli that carried a lacI-gene mutation (encodes the lac repressor). Which is TRUE of this mutant strain?
A. Trancription of the lac operon is repressed.
B. Trancription of the lac operon does not change.
C. The lac operon is constitutively expressed.
D. Nonfunctional proteins are produced.
E. The lac operon is constitutively expressed and nonfunctional proteins are produced.
C. The lac operon is constitutively expressed.
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a. They both occur in prokaryotic cells. b. They both occur in plant cells. c. They both require DNA replication before cell division. d. They have nothing in common.
How many electrons are in the innermost
electron shell of a phosphorus atom?
a. 1 b. 2 c. 3 d. 5 e. 8
Which of the following is the most effective
contraceptive approach of those listed?
a. withdrawal b. diaphragm c. condoms d. douching e. rhythm method
The acid released in the stomach is
a. carbonic acid. b. hydrochloric acid. c. nitric acid. d. sulfuric acid. e. phosphoric acid.