91影视

What is the role of PLP in transamination?

Which of the 20 鈥渟tandard鈥� amino acids are (a) purely glucogenic, (b) purely ketogenic, and (c) both glucogenic and ketogenic?

Alanine, cysteine, glycine, serine, and threonine are amino acids whose breakdown yields pyruvate. Which, if any, of the remaining 15 amino acids also do so?

In the degradation pathway for isoleucine (Fig. 21-21), draw the reactions that convert tigyl CoAto acetyl CoA andpropionyl CoA.

Summarize the steps of the urea cycle. How do the amino groups of amino acids enter the cycle?