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 Form 2 Biology questions and answers on excretion and homeostasis

Explain what happens to excess amino acid in the liver of humans.

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Answer Text:
- The amino acids are broken down into amino group (#NH_2#) and carboxyl group (COOH), i.e deamination. The amino
group combines with hydrogen forming highly toxic ammonia.
- It immediately undergoes ornithine cycle where it combines with carbon (IV) oxide forming urea that is less toxic that is removed by the kidneys.
- The carboxyl group is converted to glucose/ carbohydrates and then oxidized to yield energy or is converted into neutral fats and deposited in adipose tissue


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