What is the function of the repressor in the E. coli lac operon? a. A repressor is a type of DNA sequence that is located outside the lac operon and expresses the protein that controls lactose gene expression. b. A repressor is a type of protein that inactivates the expression of the lac operon genes by binding to the DNA of the lac operon. c. A repressor is a type of DNA sequence which activates or inactivates the lac operon genes by acting as a protein binding site. d. A repressor is a type of DNA sequence that that activates the expression of the lactose genes by acting as an RNA polymerase binding site for the lac operon.
Added by -Ngeles M.
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A repressor is a protein that binds to specific DNA sequences and inhibits the transcription of genes. Now, let's analyze each option: a. This option states that a repressor is a DNA sequence, which is incorrect. A repressor is a protein, not a DNA sequence. b. Show more…
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The functions of the lac operon's components were defined by mutations. Each of the following phenotypes was found for a mutation in the lac operon. Describe what kind of change might give rise to this phenotype. a. A mutation that maps to the repressor in which the lac operon is transcribed constitutively. b. A mutation that maps to the repressor in which the lac operon is never transcribed. c. A mutation that maps to the operator in which the lac operon is transcribed constitutively. d. A mutation that maps to the lacZ gene that fails to produce galactoside permease.
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Match each component of the lac operon in E. coli with its best description. lac I gene CAP + cAMP repressor protein lac permease (galactoside permease) beta-galactosidase promoter operon transporter that brings lactose codes for repressor protein set of genes that are transcribed sequence of DNA upstream from binds at operator site to block bind at activator site to activate enzyme that cleaves lactose
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