Multiple Choice
What does the primary structure of a protein refer to?
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4. Protein Structure
Primary Structure of Protein
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Which level of protein structure is defined by the actual sequence of amino acids present in the polypeptide chain?
A
Tertiary structure
B
Quaternary structure
C
Secondary structure
D
Primary structure
Verified step by step guidance1
Understand the four levels of protein structure: Primary, Secondary, Tertiary, and Quaternary. Each level represents a different aspect of protein organization.
Recall that the Primary structure refers to the linear sequence of amino acids in a polypeptide chain, connected by peptide bonds. This sequence is determined by the genetic code.
Secondary structure involves local folding patterns such as α-helices and β-sheets, stabilized by hydrogen bonds between backbone atoms.
Tertiary structure refers to the overall three-dimensional shape of a single polypeptide chain, stabilized by interactions such as hydrogen bonds, ionic bonds, hydrophobic interactions, and disulfide bridges.
Quaternary structure describes the arrangement and interaction of multiple polypeptide chains (subunits) in a protein complex. Based on this understanding, the correct answer is Primary structure, as it specifically refers to the sequence of amino acids.
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