Which of the following amino acids is associated with an increased risk of developing homocystinuria, a condition characterized by elevated levels of homocysteine in the blood?

A Methionine ✓
B Phenylalanine
C Tyrosine
D Tryptophan

Explanation

Methionine is an amino acid that can be converted to homocysteine in the body, and elevated levels of homocysteine are associated with an increased risk of cardiovascular disease and other health problems.

Mnemonic

'Meth' = 'method' to remember methionine's role

Source

American Journal of Clinical Nutrition
Metabolic and Nutritional Disorders Amino Acid Metabolism Sulfur-Containing Amino Acids Hard MEDICAL Confidence: medium