Which amino acid is the precursor for the synthesis of the neurotransmitter serotonin?

A Tryptophan ✓
B Tyrosine
C Phenylalanine
D Glutamate

Explanation

Tryptophan is converted into serotonin through a series of enzymatic reactions, involving tryptophan hydroxylase and aromatic amino acid decarboxylase.

Mnemonic

'Tryp' to remember: Tryptophan → Serotonin

Source

Nelson et al., Lehninger Principles of Biochemistry
Protein Metabolism Biochemistry Amino Acid Metabolism Easy MEDICAL Confidence: high