When lactose is added to culture of Escherichia coli, its molecules get into the cell with the help of

Lactase

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Galactosidase

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Permease

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Transacetylase

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Solution

The correct option is B Permease
Lactase is a lactose digesting enzyme which digest lactose sugar which makes option A wrong. $β$ -galactosidase, encoded by lac Z gene, converts lactose into glucose and galactose. $β$ -galactoside permease, encoded by lac Y gene,transports lactose into the cell. The lac A gene codes for $β$ -galactoside transacetylase.
Thus, the correct answer is option C.

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