Questions: The distinctive spiral or pleated sheet of a protein is known as its secondary structure.

The distinctive spiral or pleated sheet of a protein is known as its secondary structure.
Transcript text: The distinctive spiral or pleated sheet of a protein is known as its $\qquad$ structure. primary secondary tertiary quaternary
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Solution

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The answer is the second one: secondary.

Explanation for each option:

  • Primary: This refers to the linear sequence of amino acids in a protein. It does not describe the three-dimensional shape or folding patterns like spirals or sheets.
  • Secondary: This describes the local folding patterns of the protein chain, such as alpha helices (spirals) and beta-pleated sheets. These structures are stabilized by hydrogen bonds.
  • Tertiary: This refers to the overall three-dimensional shape of a single protein molecule, including how the secondary structures fold and interact with each other.
  • Quaternary: This describes the structure formed by the assembly of multiple protein molecules or polypeptide chains, often referred to as subunits.

Summary: The distinctive spiral or pleated sheet of a protein is known as its secondary structure.

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