Multiple choice

If radioactive nitrogen-15 is available during synthesis, it would show up in which of the following molecules?

  1. Phosphoenolpyruvate

  2. Haemoglobin

  3. Fatty acids

  4. Glycogen
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B Correct answer
Explanation

Radioactive nitrogen-15 would appear in haemoglobin because haemoglobin is a protein containing nitrogen in its amino acids. Proteins incorporate nitrogen during synthesis. Phosphoenolpyruvate (PEP) contains carbon, hydrogen, oxygen, and phosphorus but no nitrogen. Fatty acids contain only carbon, hydrogen, and oxygen. Glycogen is a polysaccharide of glucose, containing only carbon, hydrogen, and oxygen.

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