Please help Amino acids can be precursors for other non-protein molecules in a c

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Amino acids can be precursors for other non-protein molecules in a cell. Choose all the statements that are TRUE about the use of amino acids in other metabolic pathways. Glycine is used to build some prosthetic heme groups Glutamate can be converted into an important neurotransmitter. Glutathione is a tetrapeptide synthesized outside of the ribosome. Porphyrin rings are synthesized from four different amino acids. Glutathione can vary in oxidation state based on its methionine residue

Explanation / Answer

1) It is true, because in heme groups biosynthesis, the first essential step carried out inside the mitochondria involves a condensation of 1 molecule of glycine and 1 molecule of succinyl-CoA , 2)It is true, Glutamate is an important excitatory neurotransmitter in human cerebral cortex. 3) It is false, because Glutathione isn't a tetrapeptide, it is a tripeptide.4)It is false, because porphyrin rings are synthesized from four pyrrole groups. Pyrrole is not an aminoacid. 5)It is false, Glutathione only can vary in oxidation state based on the free radicals concentration in cells.

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