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(A) The metabolic pathway is given as $A \xrightarrow{X} B \xrightarrow{Y} C$. Here,$X$ and $Y$ represent the enzymes responsible for converting $A$ t

Vedclass · Accepted Answer

Only $X$

Vedclass · Answer

(A) The metabolic pathway is given as $A \xrightarrow{X} B \xrightarrow{Y} C$. Here,$X$ and $Y$ represent the enzymes responsible for converting $A$ to $B$ and $B$ to $C$,respectively. Since the mutant organism cannot survive on medium $A$ but grows when $B$ is added,it indicates that the organism can utilize $B$ to produce $C$ (or other downstream products) but cannot convert $A$ into $B$. This implies that the enzyme $X$ is non-functional or the gene coding for enzyme $X$ is defective. Therefore,the correct option is $A$.

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