11.7 Protein Catabolism

Question 1

When does protein catabolism occur?

Answer 1

Only under conditions of
starvation.

Question 2

Where does protein digestion occur?

Answer 2

Primarily in the small intestine

Question 3

How are AA’s used as energy?

Answer 3

Carbon skeletons of amino acids are used for energy, either through gluconeogenesis or ketone body formation. Amino groups are fed into
the urea cycle for excretion. The fate of a side chain depends on its chemistry.