Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1259188132
ISBN 13: 978-1-25918-813-8

Chapter 16 - Control of Gene Expression - Review Questions - Understand - Page 325: 4

Answer

C.

Work Step by Step

The lac operon's positive regulator is the CAP protein, and the negative regulator is the repressor (C.). A. and B. disagree with by saying that both are either positive or negative regulators, and D. is wrong because it says that these proteins affect protein synthesis, whereas they actually affect transcription.
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