Each of the twenty standard amino acids differs from all the others in
Correct answer: B. the nature of its R group
- A. the structure of its amino group
- B. the nature of its R group
- C. the structure of its carboxyl group
- D. the number of peptide bonds it can form
Explanation
Every amino acid shares the same amino group, carboxyl group and central carbon, so only the variable R group distinguishes one from another and gives it its chemical character. This is why the R group, not the backbone, determines where an amino acid sits in a folded protein.
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About Classification of Biological Molecules
Biological molecules are classified as carbohydrates, lipids, proteins and nucleic acids, with water, minerals and vitamins also supporting cellular processes. The key distinctions involve their monomers, chemical bonds, structures and functions, including glucose and starch, fatty acids and triglycerides, amino acids and polypeptides, and nucleotides in DNA and RNA.
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