The efficiency of the promoter for the repressor protein and whether the synthesis of the repressor is constitutive or inducible. Introduction: The regulatory proteins bind to the DNA (deoxyribonucleic acid) and play a key role in determining which genes are to be activated. These are of two types, namely, the repressor and activator proteins. The proteins, whose synthesis is regulated by inducers are known as inducible proteins, while the proteins that are synthesized at a constant rate all the time are known as constitutive proteins. In the given case, a regulatory gene codes for the repressor protein, which is synthesized in small quantities at a constant rate. This protein acts on the lac operon of Escherichia coli ( E. coli ). A promoter is a DNA region, which initiates the process of transcription of a certain gene by binding with the ribonucleic acid (RNA) polymerase.

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Chapter 16.1, Problem 4R

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The efficiency of the promoter for the repressor protein and whether the synthesis of the repressor is constitutive or inducible.

Introduction:

The regulatory proteins bind to the DNA (deoxyribonucleic acid) and play a key role in determining which genes are to be activated. These are of two types, namely, the repressor and activator proteins. The proteins, whose synthesis is regulated by inducers are known as inducible proteins, while the proteins that are synthesized at a constant rate all the time are known as constitutive proteins.

In the given case, a regulatory gene codes for the repressor protein, which is synthesized in small quantities at a constant rate. This protein acts on the lac operon of Escherichia coli (E. coli). A promoter is a DNA region, which initiates the process of transcription of a certain gene by binding with the ribonucleic acid (RNA) polymerase.

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If CAP is bound to the Promoter of the Lac Operon and the repressor protein is not bound to the operator, which of the following is true: a.Glucose Levels are low & Lactose is absent b.Glucose is absent & Lactose is present c.cAMP is low & Lactose is Absent d.Glucose and Lactose are Present e.cAMP is low & Lactose is present

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