Transcriptional Regulation - Transcriptional Regulation The...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Transcriptional Regulation The main objective of the regulation of mRNA synthesis is to produce appropriate mRNA molecules that encode enzymes in response to changes in environment. This is a process of adaptation to the environment. While transcriptional regulation is slower than direct regulation of enzyme activity but it is more efficient. Housekeeping genes are those genes or proteins produced all the time; and these are said to be constitutively expressed. The lactose operon is a system often used to model transcriptional regulation. It is useful because it exhibits both positive and negative regulation. An operon is a gene or group of genes under the regulation of a single promoter (and its regulatory/operator sequences). Many genes are only expressed when they are needed. Each set of genes has a promoter which brings the RNA polymerase to initiate transcription; the promoter can also induce transcription (positive regulation) or inhibit transcription (negative regulation). Lactose, a disaccharide, may be broken down by beta-galactosidase into glucose and galactose, two monosaccharides. Glucose leads into metabolic pathways and galactose leads to
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern