Which of the following amino acids is most closely associated with the development of homocystinuria, a condition characterized by elevated levels of homocysteine in the blood?
Explanation
Homocystinuria is most closely associated with methionine, as it is a condition characterized by impaired conversion of homocysteine to methionine due to deficiencies in enzymes such as cystathionine beta-synthase or methionine synthase.
Source
Harper's Illustrated Biochemistry