Multiple Choice
In all standard amino acids, which functional groups are always present on the alpha carbon (in their non-modified form)?
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3. Amino Acids
Amino Acid Groups
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In the general structure of an amino acid, what does the R group represent?
A
The alpha carbon that is always achiral in amino acids
B
The variable side chain that differs among amino acids and largely determines their chemical properties
C
The carboxyl group that is typically deprotonated as at physiological pH
D
The amino group that is typically protonated as at physiological pH
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