In the Gastrointestinal (GI)tract,dopamine Functions as a Modulator of the Enteric

question 3

Multiple Choice

In the gastrointestinal (GI) tract,dopamine functions as a modulator of the enteric nervous system or as a paracrine substance.What essential enzyme is required for synthesis of dopamine in the dopaminergic system in the GI tract?

• A) Tryptophan hydroxylase
• B) Tyrosine hydroxylase
• C) Catechol-O-methyltransferase (COMT)
• D) Monoamine oxidase (MAO)

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Definitions:

Nucleotide Sequence

The order of nucleotides in a segment of DNA or RNA, representing the genetic information of an organism.

Gly-His-Lys

A tripeptide consisting of glycine, histidine, and lysine, which is often studied for its role in wound healing and other biological functions.

Codons

Sequences of three nucleotides in mRNA that code for specific amino acids during protein synthesis or signal the termination of protein elongation.

Codon Sequence

A specific sequence of three nucleotides in mRNA that specifies the addition of a particular amino acid to a protein chain during biosynthesis.