In Normal Animals and An, the Rate-Limiting Step in the Biosynthesis

question 120

Multiple Choice

In normal animals and an, the rate-limiting step in the biosynthesis of the catecholamine neurotransmitters dopamine and norepinephrine is

• A) the transport of L-tyrosine across the blood brain barrier.
• B) the decarboxylation of dihydroxyphenylalanine by DOPA decarboxylase.
• C) the 3-0-methylation of the catechol nucleus by catechol-0-methyl transferase.
• D) the hydroxylation of L-tyrosine by tyrosine hydroxylase.
• E) the action of monoamine oxidase on the beta-phenethylamine nucleus.

---

Definitions:

Battery Case

A legal dispute or instance involving the unconsented physical contact or harm to another person.

Question Of Fact

An issue to be decided by the jury in a trial concerning the reality of events or the existence of conditions.

Court

A governmental institution authorized to decide legal disputes, administer justice, and interpret laws.

Internet Transactions

The act of purchasing, selling, or swapping products, services, or data through the internet.