Multiple choice

Products of adenine and guanine metabolism are excreted by humans as

  1. ammonia

  2. urea

  3. uric acid

  4. allantoin

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Adenine and guanine are purines. In humans, purine metabolism end products are excreted as uric acid. Ammonia is excreted by aquatic animals. Urea is the excretory product of amino acid metabolism (urea cycle). Allantoin is further breakdown of uric acid in some mammals but not in humans.