Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 16 - Control of Gene Expression - Review Questions - Apply: 3

Answer

B.

Work Step by Step

Both trp and lac operons are regulated to give the cell the appropriate amount of metabolic enzymes (B.). They do not both rely just on either negative or positive regulation (A. and C.), and D. is wrong since it says that the enzymes are made all of the time, which is the opposite of the truth.
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