Multiple choice

Nitrogenous wastes are produced by the utilisation of foodstuffs, which are

  1. carbohydrates

  2. lipids

  3. proteins

  4. vitamins
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C Correct answer
Explanation

Nitrogenous wastes (ammonia, urea, uric acid) are produced during the metabolism of proteins. Proteins contain nitrogen in their amino groups, which must be removed when proteins are broken down for energy or converted to other molecules. Carbohydrates and lipids do not contain nitrogen and therefore do not produce nitrogenous wastes when metabolized.

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