Answer
A. Primary level.
Work Step by Step
A takes it structure from the covalent peptide bonds between successive amino acids, while B through D usually involve at least some hydrogen bonding to get their structure.
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 5 - Test Your Understanding - Level 1 - Knowledge/Comprehension - Page 91: 4
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