Question

Select ALL of the following which cells can make from the amino acid tryptophan:

  

epinephrine

   

thyroid hormone

   

serotonin

   

glutamate

   

niacin

Answer 1

ANSWER: The following can be made by the cells from the amino acid- tryptophan -The correct alternative is- Serotonin and Niacin.

REASON- Tryptophan is a non-polar aromaticamino acid and contains  $\alpha$-amino group , an $\alpha$ -carboxylic acid group and indole as a side chain.Tryptophan is the precursor of the neurotransmitter Serotonin and niacin i.e vitamin-B3.

Tryptophan is converted to Serotonin-

-Tryptophan is first converted to 5- hydroxytryptophan by the action of the enzyme tryptophan hydroxylase.

- Then, the 5-hydroxytryptophan is converted into serotonin by the action of aromatic amino acid decarboxylase enzyme.

Trytophan is converted to Niacin-

-Tryptophan can be converted into niacin compounds and can be supplied to body .