Multiple choice

Directions: Read the following information and answer the question given below: Proteins acquire specific and precise folds to perform a desired function. Therefore, the foldings of the proteins are highly essential and specific. Folds are further composed of two major 2o structures, i.e. alpha helices and beta sheets.

If a protein is a 153 residues protein and given that its structure is a continuous alpha-helix, what would be the length of the protein?

  1. 552 nm

  2. 360 nm

  3. 534 nm

  4. 283 nm
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D Correct answer
Explanation

The pitch of the alpha-helix is 5.4 Å or 0.54 nm, which is equal to 1.5 (translation height) * 3.6 (residues in one turn). Therefore, the length of 153 amino acid protein will be 153/.54 = 283 nm

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