What Do Barn Owls Eat | Barn Owl Facts For Kids. Whether they are living in natural environment or artificial roosting places (such as ruined buildings) barn owls will hunt terrestrial mammals including rodents. Barn owls are known to fly just above the open ground hovering over spots that cover potential prey.
Regulation of gene expression includes a wide range of mechanisms that are used by cells to increase or decrease the production of specific gene products (protein or RNA), and is informally termed gene regulation. Repressors bind to the Operator, coding sequences on the DNA strand that are close to or overlapping the promoter region, impeding RNA polymerase's progress along the strand, thus impeding the expression of the gene.The image to the right demonstrates regulation by a repressor in the lac operon.
Report Abuse. Transcription factors are protein complexes that help RNA polymerase bind to DNA. RNA polymerase is the enzyme that transcribes genes to make messenger RNA, which is then used to make protein.By controlling RNA polymerase's access to the gene, transcription factors control the rate at which a gene is transcribed.Without transcription factors, cells would not be able to effectively regulate the rate at which genes are expressed.hat is the function of transcription factors in eukaryotic cells? A. They control the expression of certain genes. B. They bend the DNA to bring it close to the operator.