Multiple Choice
In humans, which amino acid is the most abundant in the body (by total free and protein-bound content)?
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3. Amino Acids
Amino Acid Groups
Multiple Choice
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
Verified step by step guidance1
Recall the general structure of an amino acid, which includes a central alpha carbon (C\_\(\alpha\)) bonded to four groups: an amino group (NH\_2), a carboxyl group (COOH), a hydrogen atom, and a variable side chain (R group).
Understand that the amino group and carboxyl group are consistent across all standard amino acids and form the backbone of proteins when linked by peptide bonds.
Recognize that the peptide bond is the covalent linkage formed between the carboxyl group of one amino acid and the amino group of another, creating the protein's backbone chain.
Identify that the primary difference among amino acids lies in the side chain (R group) attached to the alpha carbon, which varies in size, charge, polarity, and chemical properties.
Conclude that the side chain (R group) is the structural feature that distinguishes one amino acid from another within proteins.
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