Answer :
The main regulatory sequences that are present in genes are Enhancers, Promoters, and suppressors.
The Promoter is a small DNA sequence on a gene, where the RNA (ribonucleic acid) polymerase enzyme can bind for the transcription of that gene. The prokaryotes have a -10 region (TATA box), as their promoter region, whereas the eukaryotes have -35 and – 10 regions as promoters. So, it does not have any effect on the level of gene expression. Enhancers are the DNA sequences, which enhance the gene expression; they are present above the promoter region. Thus, the removal of promoters cannot induce gene expression. Silencers are the DNA regions present below or above the promoter regions; they mostly silence or decrease the level of gene expression. Thus, the removal of silencer regulatory regions results in the over-expression of the genes.
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