Tyrosine is the precursor of

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(D) Tyrosine is an amino acid that serves as the precursor for the synthesis of catecholamines,which include dopamine,norepinephrine (noradrenaline),a

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Both $(a)$ and $(b)$

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(D) Tyrosine is an amino acid that serves as the precursor for the synthesis of catecholamines,which include dopamine,norepinephrine (noradrenaline),and epinephrine (adrenaline).The biosynthetic pathway is as follows:Tyrosine $\rightarrow$ Dihydroxyphenylalanine $(DOPA)$ $\rightarrow$ Dopamine $\rightarrow$ Norepinephrine $\rightarrow$ Epinephrine.Since both adrenaline (epinephrine) and noradrenaline (norepinephrine) are derived from tyrosine,the correct answer is both $(a)$ and $(b)$.

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