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What does the structural gene (y) of a lac operon code for?
- a)β-galactosidase
- b)Transacetylase
- c)Glucagon
- d)Permease
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
What does the structural gene (y) of a lac operon code for?a)β-ga...
The structural gene (z) of the lac operon codes for β-galactosidase. It is responsible for the hydrolysis of polysaccharides. The ‘y’ genes code for permease. It increases the permeability of a cell to β-galactosidase. The ‘a’ genes code for transacetylase.
Most Upvoted Answer
What does the structural gene (y) of a lac operon code for?a)β-ga...
Structural gene (y) of a lac operon
The structural gene (y) of a lac operon codes for Permease.
Explanation
- Permease is a protein that functions as a lactose transporter in bacterial cells.
- It is responsible for transporting lactose into the cell, where it can then be broken down by β-galactosidase into glucose and galactose.
- The lac operon is a cluster of genes that regulate the metabolism of lactose in bacteria. It consists of three structural genes: lacZ, lacY, and lacA.
- The lacZ gene codes for β-galactosidase, which breaks down lactose into glucose and galactose.
- The lacY gene codes for Permease, which transports lactose into the cell.
- The lacA gene codes for Transacetylase, which is involved in the acetylation of certain sugars.
- Glucagon is a hormone produced in the pancreas of humans and other vertebrates, and it is not related to the lac operon in bacteria.
Therefore, the correct answer is option 'D) Permease'.
The structural gene (y) of a lac operon codes for Permease.
Explanation
- Permease is a protein that functions as a lactose transporter in bacterial cells.
- It is responsible for transporting lactose into the cell, where it can then be broken down by β-galactosidase into glucose and galactose.
- The lac operon is a cluster of genes that regulate the metabolism of lactose in bacteria. It consists of three structural genes: lacZ, lacY, and lacA.
- The lacZ gene codes for β-galactosidase, which breaks down lactose into glucose and galactose.
- The lacY gene codes for Permease, which transports lactose into the cell.
- The lacA gene codes for Transacetylase, which is involved in the acetylation of certain sugars.
- Glucagon is a hormone produced in the pancreas of humans and other vertebrates, and it is not related to the lac operon in bacteria.
Therefore, the correct answer is option 'D) Permease'.
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