Multiple choice

Polypeptide backbone doesn't contain

  1. Side chains

  2. Peptide bond

  3. Nitrogen atom

  4. Asymmetric carbon atom
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A Correct answer
Explanation

The polypeptide backbone consists of the repeating N-Calpha-C sequence. The side chains (R-groups) are attached to the alpha-carbon but are not considered part of the backbone itself.

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