Multiple Choice
Which of the following best describes how amino acids affect the tertiary structure of a protein?
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4. Protein Structure
Tertiary Structure of Protein
Multiple Choice
In the context of protein structure, what best describes the tertiary structure of a protein?
A
The linear sequence of amino acids in a polypeptide chain linked by peptide bonds.
B
Local, repetitive backbone conformations such as -helices and -sheets stabilized primarily by backbone hydrogen bonding.
C
The overall three-dimensional folding of a single polypeptide chain formed by interactions among side chains (e.g., hydrophobic interactions, hydrogen bonds, ionic interactions, and disulfide bonds).
D
The arrangement and interactions of multiple polypeptide subunits to form a functional protein complex.
Verified step by step guidance1
Step 1: Understand the hierarchy of protein structure levels: primary, secondary, tertiary, and quaternary structures.
Step 2: Recall that the primary structure refers to the linear sequence of amino acids linked by peptide bonds.
Step 3: Recognize that the secondary structure involves local repetitive conformations like α-helices and β-sheets stabilized mainly by hydrogen bonds in the backbone.
Step 4: Identify that the tertiary structure describes the overall three-dimensional folding of a single polypeptide chain, which is stabilized by interactions among the side chains, including hydrophobic interactions, hydrogen bonds, ionic bonds, and disulfide bridges.
Step 5: Note that the quaternary structure involves the arrangement and interaction of multiple polypeptide subunits to form a functional protein complex.
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