Multiple choice

Which of the following atoms is replaced by selenium in cysteine amino acid to form selenocysteine?

  1. Sulphur

  2. Nitrogen

  3. Oxygen

  4. Phosphorus

  5. Chlorine
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A Correct answer
Explanation

Selenocysteine is an L – α-amino acid found in a handful of proteins including certain peroxidases and reductases where it participates in the catalysis of electron transfer reactions. As its name implies, a selenium atom replaces the sulphur of its structural analog, cysteine.

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