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: 3

Answer

A.

Work Step by Step

In both cases, a repressor protein binds to DNA and prevents expression of an operon (negative control)--A. B. and D. are wrong since they disagree by saying that the control is positive (and, oddly, they are identical options), and C. is incorrect since it disagrees with the correct answer in terms of the kind of protein that is involved.
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