CAIE A-Level Biology A2 14.1.3 Urea Production Questions

Explain urea production in the liver using evidence from each question and mark scheme.

Exam points

Explain urea production in the liver.

[Maximum number: 3]

In mammals, excess amino acids cannot be stored in the body.
Outline the formation of urea from excess amino acids by liver cells.

deamination/amine group removed;
A amino/ $\mathrm{NH}_{2}$
ammonia/ $\mathrm{NH}_{3}$ , formed ;
combined with carbon dioxide ;
urea cycle ;
A ornithine cycle

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CAIE A-Level Biology A2 14.1.3 Urea Production Questions question 1