Biological Science (6th Edition)

by Freeman, Scott; Quillin, Kim; Allison, Lizabeth; Black, Michael; Taylor, Emily; Podgorski, Greg; Carmichael Jeff

Published by Benjamin Cummings

ISBN 10: 0321976495

ISBN 13: 978-0-32197-649-9

Chapter 8 - Energy and Enzymes: An Introduction to Metabolism - Review - Case Study - Page 188: 12

Answer

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Work Step by Step

If the concentration of phenylalanine is low, the active site of the enzyme phenylalanine hydroxylase is blocked and the substrate does not bind to the enzyme. When the concentration of phenylalanine is high, PAH is allosterically activated by phenylalanine, allowing the conversion of phenylalanine to tyrosine.

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