Which amino acid is unique in serving as a precursor for the synthesis of both neurotransmitters and hormones in the human body?

A Tyrosine ✓
B Tryptophan
C Phenylalanine
D Glycine

Explanation

Tyrosine is an amino acid that serves as a precursor for the synthesis of several important neurotransmitters, such as dopamine, norepinephrine, and epinephrine, as well as hormones like thyroxine.

Source

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