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 (12th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Published by
Pearson
ISBN 10:
0135188741
ISBN 13:
978-0-13518-874-3
Chapter 41 - 41.1 - Concept Check - Page 902: 2
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