In Glycin an amino acid R group is replaced by____________?
Correct answer: A. H
- A. H
- B. CH3
- C. COOH
- D. C = O
Explanation
Glycine is the simplest amino acid because its side, or R, group is a hydrogen atom, giving it the structure NH2-CH2-COOH. Students may choose CH3 because alanine has a methyl R group, not glycine.
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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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