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NEETZoologyMolecular Basis of Inheritance

What is the relationship between the z, y, and genes in the lac operon?

Options

  1. AThey code for unrelated proteins
  2. BThey are involved in different metabolic pathways
  3. CThey code for proteins that are needed together to function in the same or related metabolic pathways
  4. DThey are not involved in any metabolic pathways

Correct answer

C. They code for proteins that are needed together to function in the same or related metabolic pathways

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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