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Established! Established!
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Each amino acid differs from others only by the
A) number of its carboxyl groups.
B) number of central carbon atoms.
C) number of peptide bonds in the molecule.
D) characteristic of its R group.
E) size of its amino group.
Textbook 
Principles of Human Physiology

Principles of Human Physiology


Edition: 5th
Author:
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ch1990ch1990
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