Multiple Choice
Which level of protein structure corresponds to the formation of α-helices and β-pleated sheets?
1. Introduction to Biochemistry
Proteins
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Which of the following is not a component of an amino acid?
A
Peptide
B
α-carbon
C
Amino group
D
Carboxyl group
Verified step by step guidance1
Understand the basic structure of an amino acid. An amino acid typically consists of an α-carbon, an amino group (-NH2), a carboxyl group (-COOH), and a side chain (R group) that varies between different amino acids.
Identify the components listed in the problem: α-carbon, amino group, carboxyl group, and peptide.
Recall that a peptide is not a component of a single amino acid. Instead, peptides are chains of amino acids linked together by peptide bonds.
Recognize that the α-carbon, amino group, and carboxyl group are indeed components of an amino acid, as they form the backbone of the amino acid structure.
Conclude that the term 'peptide' refers to a linkage between amino acids, not a component of an individual amino acid.
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