객관식
Which set of words best describes the side chain of the amino acid threonine?
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3. Amino Acids
Amino Acid Groups
객관식
1. Which of the following best describes the term 'peptide chain' in the context of amino acid groups?
A
A circular arrangement of amino acids forming a ring structure
B
A single amino acid with a modified side chain
C
A group of amino acids with similar side chain properties
D
A linear sequence of amino acids linked by peptide bonds
검증된 단계별 안내1
Understand the term 'peptide chain': A peptide chain refers to a linear sequence of amino acids that are covalently linked together by peptide bonds. Peptide bonds are formed through a condensation reaction between the carboxyl group (-COOH) of one amino acid and the amino group (-NH2) of another amino acid.
Clarify the structure: Unlike circular arrangements or single amino acids, a peptide chain is a linear structure. It has a defined directionality, starting with the amino (N-) terminus and ending with the carboxyl (C-) terminus.
Eliminate incorrect options: The first option, 'A circular arrangement of amino acids forming a ring structure,' describes a cyclic peptide, which is not the same as a peptide chain. The second option, 'A single amino acid with a modified side chain,' refers to an individual amino acid, not a chain. The third option, 'A group of amino acids with similar side chain properties,' describes a classification based on side chain characteristics, not a peptide chain.
Focus on the correct definition: The correct answer is 'A linear sequence of amino acids linked by peptide bonds,' which accurately describes the structure and formation of a peptide chain.
Relate to biological significance: Peptide chains are fundamental components of proteins, which are essential macromolecules in biological systems. Proteins are formed when one or more peptide chains fold into specific three-dimensional structures.
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