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nmdcat.online June 27, 2026

The biological significance of the R-group in an amino acid lies in its ability to

A. Form peptide bonds with the next amino acid in the chain
B. Determine the unique chemical properties of the amino acid
✓
C. Provide the hydrogen for the release of a water molecule
D. Create the phosphodiester backbone of the final protein

📝 Explanation

The 20 common amino acids all share a common backbone (amino group, α-carbon, carboxyl group) but differ only in their side chain, the R-group. The size, shape, charge, hydrophobicity, and chemical reactivity of the R-group confer the unique properties to each amino acid.

📖 Additional Information

  • Form peptide bonds with the next amino acid in the chain
  • Determine the unique chemical properties of the amino acid
  • Provide the hydrogen for the release of a water molecule
  • Create the phosphodiester backbone of the final protein

The 20 common amino acids all share a common backbone (amino group, α-carbon, carboxyl group) but differ only in their side chain, the R-group. The size, shape, charge, hydrophobicity, and chemical reactivity of the R-group confer the unique properties to each amino acid.

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