Biology (11th Edition)

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

Chapter 15 - Genes and How They Work - Figure 15.6 - Inquiry Question: 1

Answer

Having two non-identical parts to the promoter provides directionality. The polymerase enzyme binds and "knows" in which direction to starting working.

Work Step by Step

For an analogy, think about your hand. The non-identical nature of your digits, especially the thumb, provides directionality which helps you know how, for example, to put your gloves on (the thumb goes in the thumb hole, etc.).
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