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. Transcription of the lac operon is repressed.
b. Transcription 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.