Multiple Choice
In the context of amino acid structure, what primarily makes each of the 20 standard amino acids unique?
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3. Amino Acids
Amino Acid Groups
Multiple Choice
In proteinogenic amino acids, what primarily distinguishes one amino acid from another?
A
The presence or absence of the amino group
B
The presence or absence of the carboxyl group
C
The fact that all amino acids have a central carbon bonded to four different groups
D
The identity of the side chain (R group) attached to the carbon
Verified step by step guidance1
Understand the general structure of proteinogenic amino acids: each has a central (alpha) carbon atom bonded to four groups — an amino group (−NH\_2), a carboxyl group (−COOH), a hydrogen atom, and a variable side chain (R group).
Recognize that the amino group and carboxyl group are common to all amino acids and are not what differentiates one amino acid from another.
Note that the central carbon being bonded to four different groups is a shared feature of all amino acids, contributing to their chirality but not their identity.
Focus on the side chain (R group) attached to the alpha carbon, which varies among amino acids and determines their unique chemical properties and functions.
Conclude that the primary distinction between different proteinogenic amino acids is the identity and chemical nature of their side chain (R group).
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