Which of the following is true? a) Silencers are proteins that bind to enhancer

Question

Which of the following is true? a) Silencers are proteins that bind to enhancer DNA sequences b) Activators are proteins that bind to enhancer DNA sequences c) Enhancers are proteins that bind to Activator DNA sequences d) A repressor is a DNA sequence, NOT a protein. A promoter ____ a cis-acting site. a) is b) is not If a wild type E. coil strain is grown in the presence of lactose, the operon will be: a) transcribed b) NOT transcribed In the lactose operon of E. coil lac o is the operator gene, lac I is the repressor gene and lac r codes for beta - galactosidase. If an E. coil strain of genotype lac o "z"/F "O" is grown in the absence of lactose, the lac z gene will be: a) transcribed b) NOT transcribed In the lactose operon of E. coli lac o is the operator gene, lac I is the repressor gene and lac z codes for beta-galactosidase. If an E. coli strain of genotype lac i z/F'i' is grown in the absence of lactose, the lac x gene will be: a) transcribed b) NOT transcribed In positive regulation, an operon is transcribed _____ when the regulatory protein is bound to the DNA. A) more b) less

Explanation / Answer

1) activators are the protein which binds to the enhancer DNA sequence.

2) promoters are Cis acting elements.

3) in the presence of lactose, repressor binds with lactose hence will not be able to binds with operator sequence so the lactose operon will transcribed.

4) transcribed because operator is mutated so repressor will not be able to bind with it and gene transcribed.

5) if repressor is functional, the operator is not mutated and there is low lactose level then it will bind to operator sequence and stop transcription.

6) less

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