alleryThe lac operon (Jacob & Monod) consists of which structural genes?
Ai, p, o
BOnly one gene for β-galactosidase
Cz, y, a (β-galactosidase, permease, transacetylase)
Di, z, y
Answer & Solution
Correct answer: C. z, y, a (β-galactosidase, permease, transacetylase)
**Lac operon structural genes: z (β-galactosidase), y (permease), a (transacetylase)**.
The **i gene (regulatory)** codes for the lac repressor, sitting upstream.
Promoter and operator flank the structural cluster.
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