Select the correct combination of statements for the neurotransmitters

Acetylcholine is inactivated mainly by presynaptic reuptake

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Tyrosine is essential for the formation of dopamine

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Adrenaline is formed by methylation of the noradrenaline

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Both B and C

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Solution

The correct option is D Both B and C
Tyrosine is a nonessential amino acid. It is a building block for neurotransmitters including adrenaline, noradrenaline and dopamine. Tyrosine is transformed into noradrenaline through many steps. The methylation of noradrenaline results in the formation of adrenaline. This reaction is catalyzed by the enzyme phenylethanolamine N-methyltransferase (PNMT). Serotonin biosynthesis is inhibited by phenylalanine.
Thus, the correct answer is options D.

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