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NEETZoologyMolecular Basis of Inheritance

What is the role of permease in the lac operon?

Options

  1. ASynthesis of the repressor protein
  2. BTranscription of the operon
  3. CHydrolysis of lactose into its monomeric units
  4. DTransport of lactose into the cell

Correct answer

D. Transport of lactose into the cell

Step-by-step solution

The lac operon consists of one regulatory gene (the i gene – here the term i does not refer to inducer, rather it is derived from the word inhibitor) and three structural genes (z, y, and a). The i gene codes for the repressor of the lac operon. The z gene codes for beta-galactosidase (β-gal), which is primarily responsible for the hydrolysis of the disaccharide, lactose into its monomeric units, galactose and glucose. The y gene codes for permease, which increases permeability of the cell to β-galactosides. The ge

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