Which of the following is(are) not cis-acting? a. lacI b. lacO c. TATA box d. Enhancers e. Items a and b are not cis-acting

Which of the following is(are) not cis-acting? a. lacI b. lacO c. TATA box d. Enhancers e. Items a and b are not cis-acting f. There is not enough information to determine this

Expert Solution

4. The correct option is ............................a.lacI

The components of transcription are termed as cis acting and transacting.
Cis acting is the structural portion of a gene which is required for gene expression.
Trans acting factors are the proteins which associate with Cis acting factors to control gene expression.
Cis acting factors can be located in a promoter or an enhancer.
Cis acting elements are located in non coding regions of DNA.
A single cis element is sufficient to produce a regulatory response.
TATA box is a promoter sequence, and it indicates where the genetic sequence could be read and decoded in a DNA.
Transcription factors associate with the TATA box to promote the transcription of a gene.
Enhancer is a region of DNA that bound to transcription activators (mostly proteins) to activate the transcription of a gene.
The operator present in the lac operon also forms as an example of the Cis acting regulatory sequence.
Lac I is a repressor protein involved in the lactose metabolism, LacI inhibits the expression of genes to transcribe the protein coding.

gladiator answered 3 years ago

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