Multiple Choice
Which of the following accurately describes the tertiary structure level of a protein?
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4. Protein Structure
Tertiary Structure of Protein
Multiple Choice
In biochemistry, what best describes the tertiary structure of a protein?
A
The arrangement and interaction of multiple polypeptide subunits to form a functional protein complex
B
The linear sequence of amino acids in a polypeptide chain linked by peptide bonds
C
Local folding patterns such as -helices and -sheets stabilized primarily by backbone hydrogen bonding
D
The overall three-dimensional folding of a single polypeptide chain formed by interactions among side chains (R groups), including hydrophobic interactions, hydrogen bonds, ionic interactions, and disulfide bonds
Verified step by step guidance1
Step 1: Understand the levels of protein structure. Proteins have four levels of structure: primary, secondary, tertiary, and quaternary.
Step 2: Recall that the primary structure is the linear sequence of amino acids linked by peptide bonds.
Step 3: Recognize that the secondary structure involves local folding patterns such as \( \alpha \)-helices and \( \beta \)-sheets, stabilized mainly by hydrogen bonds between backbone atoms.
Step 4: Identify that the tertiary structure refers to the overall three-dimensional shape of a single polypeptide chain, which arises from interactions among the side chains (R groups) of amino acids. These interactions include hydrophobic interactions, hydrogen bonds, ionic bonds, and disulfide bridges.
Step 5: Differentiate tertiary structure from quaternary structure, which involves the arrangement and interaction of multiple polypeptide subunits to form a functional protein complex.
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