Answer
Some of these can be synthesized in the body.
Work Step by Step
Amino acids are considered "essential" when they cannot be synthesized in the body and must be obtained from external sources.
Campbell Biology (10th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Published by
Pearson
ISBN 10:
0321775651
ISBN 13:
978-0-32177-565-8
Chapter 41 - 41.1 - Concept Check - Page 897: 2
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