In animals, the synthesis of cysteine involves all of the following, except :
A) Addition of a carbon group to glycine.
B) Transfer of the sulfur group from methionine.
C) An intermediate of homocysteine.
D) Participation of ATP.
E) All of these reactions are involved in synthesizing cysteine in animals.

Question

Quizplus · Accepted Answer

The synthesis of cysteine in animals does not involve the addition of a carbon group to glycine. Instead, it primarily involves the transfer of a sulfur group from methionine to serine to form cysteine, with homocysteine serving as an intermediate, and ATP is indeed involved in the process.

In Animals, the Synthesis of Cysteine Involves All of the Following