Question

A DNA molecule that recognizes specific transcription factors that can stimulate transcription of nearby genes is depicted by

• A. Promoter
• B. Enhancer
• C. Operator
• D. Euchromatin
• E. Heterochromatin

Answer 1

The correct option is B Enhancer

The promoter is a cis-acting site present physically continuous with transcription unit and provides a binding site for RNA polymerase enzyme. Enhancers are the upstream activation site present within promoter and interact with protein other than RNA polymerase thereby regulating the activity of the promoter and increase the frequency of gene transcription. The operator is a DNA sequence present between the promoter region and the first coding gene. The main difference between a euchromatin and heterochromatin region lies in their DNA content; euchromatin is loosely packed DNA with higher gene concentration as compare to heterochromatin which is tightly packed and has less gene concentration, thus less DNA content. Being loosely packed, euchromatin is easily transcribed. Thus, the correct answer is option B.