Class notes
Biol 301 Regulation of Gene Expression Notes la
- Course
- BIOL 301
- Institution
- Liberty University
This is a comprehensive and detailed note on;Regulation of Gene Expression for Biol 301. *Essential for Study!!
[Show more]
Content preview
Regulation of Gene ExpressionI. Regulating Gene expression
A. Why is gene regulation necessary?
1. Not all genes or their products are needed at all times
2. More efficient if they are made only when needed and turned off when not
needed
B. Levels at which gene expression is regulated in prokaryotes
1. Transcription
a) DNA →
2. RNA processing
a) RNA transcript →
3. RNA stability
a) mRNA →
4. Translation
a) Protein →
5. Post-translation
a) Function performed by protein
C. Housekeeping genes are expressed constitutively (rRNAs, structural proteins,
tRNAs)
1. These genes are always expressed the same way at the same rate/time,
behave the same in various environments
D. Regulated genes usually have specialized functions
1. Growth
2. Defense mechanism
3. Induced genes - characteristics of catabolic pathways
a) Lactose, galactose, arabinose utilization)
4. Repressed genes - characteristics of anabolic pathways
a) Tryptophan biosynthesis
5. Regulator genes control the expression of these induced/repressed
genes
a) Kinda vague
b) Better called
(1) Activators
(2) Repressors
E. Positive control of gene regulation
1. The regulator gene product is called an activator
a) Causes transcription to increase
b) Induced
2. These activators bind to their regulatory protein binding sites and
increase the transcriptional output of genes
3. Activator binding is influenced by effector molecules (inducers and
corepressors) that cause a conformational change:
a) Induced fit
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller anyiamgeorge19. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75057 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now