Multiple Choice
In humans, which amino acid is the most abundant in the body (by total free and protein-bound content)?
2
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3. Amino Acids
Amino Acid Groups
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In proteins, each amino acid differs from the others primarily in which structural feature?
A
The amino group () attached to the backbone
B
The side chain (R group) attached to the carbon
C
The peptide bond between amino acids
D
The carboxyl group () attached to the backbone
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