Regarding a bacterial transcription unit which of the follow

Regarding a bacterial transcription unit, which of the following items is a trans-acting element?

A. Stop codon
B. Rho-independent terminator
C. Pribnow box
D. RNA polymerase
E. None of these.
F. –35 region

Solution

trans-acting elements are

C. Pribnow box -promoters
D. RNA polymerase

A trans-acting DNA element is a DNA sequence that codes for a protein (a trans-acting factor) that controls the expression of a gene at a separate location by binding to its cis-acting element.Trans-acting factors are enzymes that interact with RNA polymerase.They bind to RNA polymerase to stabilize the initiation complex.They may also bind to a few promoters and serve as positive regulators.A trans-acting factor can affect the expression of genes located on separate chromosomes.