Multiple Choice
Which of the following best depicts the tertiary structures of two globular proteins in an aqueous (water) environment?
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4. Protein Structure
Tertiary Structure of Protein
Multiple Choice
In the context of protein tertiary structure, which amino acid side chain commonly forms disulfide bonds () that stabilize the folded protein?
A
Cysteine
B
Methionine
C
Lysine
D
Serine
Verified step by step guidance1
Understand that disulfide bonds are covalent bonds formed between the sulfur atoms of two amino acid side chains, which help stabilize the tertiary structure of proteins.
Recall that among the standard amino acids, only those with sulfur-containing side chains can form disulfide bonds.
Identify the amino acids with sulfur in their side chains: Cysteine and Methionine.
Recognize that Methionine contains a thioether group, which does not form disulfide bonds, whereas Cysteine contains a thiol (-SH) group capable of forming disulfide bonds.
Conclude that Cysteine side chains commonly form disulfide bonds (S—S) that stabilize the folded protein.
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