University of Central Florida (UCF) ZOO3744 Neurobiology Practice Exam 2

Tyrosine is the correct answer as it serves as the primary precursor for catecholamines, which include dopamine, norepinephrine, and epinephrine. The biosynthesis pathway of catecholamines begins with the amino acid tyrosine, which is first converted into L-DOPA by the enzyme tyrosine hydroxylase. L-DOPA is then further converted into dopamine through the action of aromatic L-amino acid decarboxylase. Subsequently, dopamine can be converted into norepinephrine and then epinephrine through additional enzymatic reactions.

Understanding this biochemical pathway highlights the vital role tyrosine plays in the production of these neurotransmitters, which are essential for various physiological functions, including mood regulation, attention, and response to stress.