LIFE SCIENCE

Detailed explanation-1: -A transcriptional activator is a protein (transcription factor) that increases transcription of a gene or set of genes. Activators are considered to have positive control over gene expression, as they function to promote gene transcription and, in some cases, are required for the transcription of genes to occur.

Detailed explanation-2: -Enhancers are DNA-regulatory elements that activate transcription of a gene or genes to higher levels than would be the case in their absence. These elements function at a distance by forming chromatin loops to bring the enhancer and target gene into proximity23.

Detailed explanation-3: -Activation of a gene-transcription-is kicked off when proteins called transcription factors bind to two key bits of DNA, an enhancer and a promoter.