Enhancer I can stimulate the transcription of gene A, but the insulator blocks its effect on gene B Enhancer ll can stimulate the transcription of gene B, but the insulator blocks its effect on gene A What would be the effect of moving the insulator to a position between enhancer Il and the promoter for gene B? Insulator-binding protein Promoter Transcription start site Transcription start site O O O O The newly positioned insulator prevents enhancer Il from stimulating the transcription of gene B. The newly positioned insulator allows enhancer Il to hyperactivate gene B transcription. The new positioning of the insulator prevents gene A expression. The newly positioned insulator allows enhancer I to activate gene B transcription.

The newly positioned insulator prevents enhancer II form stimulating the transcription of gene B.

Explanation:

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.

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