Multiple choice

What does an α-helix signify?

  1. Aggregation of protein.

  2. Tertiary structure of protein.

  3. Secondary structure of protein.

  4. Primary structure of protein.

  5. None of the above
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C Correct answer
Explanation

The secondary structure of protein is formed by the folding of linear polypeptide chain into regular structure. The folding of polypeptide chain occurs because NH and CO group in the peptide chain are linked with hydrogen bonds. The α-helix is a rod-like structure. There is an imaginary axis at the middle of the helix. Around the imaginary axis, the polypeptide chain is wound tightly.

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