Promoter sequence is an example for: (A) Cis acting factor, (B) Trans acting factor, (C) Coactivator, (D) Mediator
Answer is A. Trans acting factors control the expression of cis-regulatory element Cis-regulatory elements are DNA sequences present on the same molecule of DNA (chromosome) as the gene they regulate. E.g. Promoter is a cis-regulated element usually located upstream of the transcribed region. Enhancers are cis-regulatory elements that can be located upstream, downstream, within the introns,