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The lac operon contains three genes: lacZ, lacY, and lacA for ß-galactosidase, galactoside permease, and thiogalactoside transacetylase, respectively. The operon also contains a promoter site and an operator site. The regulatory gene includes the I gene for the Lac repressor protein and a promoter for that gene. regulatory gene DNA P₁ lacl gene The lac operon undergoes negative regulation. In the normal condition, the Lac repressor protein is active. Allolactose, an isomer of lactose, is the signal molecule that binds to the Lac repressor. Determine which events will increase the concentration of lac gene products and which will decrease the concentration of lac gene products. P O Increase in gene products The I gene is disabled. Lactose is present in the cell. The Lac repressor dissociates from DNA. Allolactose is not present in the cell. lac operon lacZ gene lacy gene lacA gene Decrease in gene products Allolactose binds to the Lac repressor protein. The Lac repressor remains bound to the operator.

The lac operon contains three genes: lacZ, lacY, and lacA for ß-galactosidase, galactoside permease, and thiogalactoside transacetylase, respectively. The operon also contains a promoter site and an operator site. The regulatory gene includes the I gene for the Lac repressor protein and a promoter for that gene. regulatory gene DNA P₁ lacl gene The lac operon undergoes negative regulation. In the normal condition, the Lac repressor protein is active. Allolactose, an isomer of lactose, is the signal molecule that binds to the Lac repressor. Determine which events will increase the concentration of lac gene products and which will decrease the concentration of lac gene products. P O Increase in gene products The I gene is disabled. Lactose is present in the cell. The Lac repressor dissociates from DNA. Allolactose is not present in the cell. lac operon lacZ gene lacy gene lacA gene Decrease in gene products Allolactose binds to the Lac repressor protein. The Lac repressor remains bound to the operator.

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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The lac operon contains three genes: lacZ, lacY, and lacA for ß-galactosidase, galactoside permease, and thiogalactoside transacetylase, respectively. The operon also contains a promoter site and an operator site. The regulatory gene includes the I gene for the Lac repressor protein and a promoter for that gene. regulatory gene DNA P₁ lacl gene The lac operon undergoes negative regulation. In the normal condition, the Lac repressor protein is active. Allolactose, an isomer of lactose, is the signal molecule that binds to the Lac repressor. P O Increase in gene products The I gene is disabled. Lactose is present in the cell. The Lac repressor dissociates from DNA. lac operon lacZ gene Determine which events will increase the concentration of lac gene products and which will decrease the concentration of lac gene products. Allolactose is not present in the cell. lacy gene lacA gene Decrease in gene products Allolactose binds to the Lac repressor protein. The Lac repressor remains bound to the operator.
Transcribed Image Text:The lac operon contains three genes: lacZ, lacY, and lacA for ß-galactosidase, galactoside permease, and thiogalactoside transacetylase, respectively. The operon also contains a promoter site and an operator site. The regulatory gene includes the I gene for the Lac repressor protein and a promoter for that gene. regulatory gene DNA P₁ lacl gene The lac operon undergoes negative regulation. In the normal condition, the Lac repressor protein is active. Allolactose, an isomer of lactose, is the signal molecule that binds to the Lac repressor. P O Increase in gene products The I gene is disabled. Lactose is present in the cell. The Lac repressor dissociates from DNA. lac operon lacZ gene Determine which events will increase the concentration of lac gene products and which will decrease the concentration of lac gene products. Allolactose is not present in the cell. lacy gene lacA gene Decrease in gene products Allolactose binds to the Lac repressor protein. The Lac repressor remains bound to the operator.
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