Summary CIE A-level Biology: Selection and Evolution (A* achieved)
11 views 0 purchase
Module
CIE A2 Biology
Institution
CIE A2 Biology
Book
Cambridge International AS & A Level Complete Biology
Hi everyone:)) Here are my CIE A2 level Biology topic notes for the syllabus. These notes are tailored to the A level syllabus as well as the mark scheme as if you do enough past paper questions you will see a recurring pattern with the types of questions asked about each topic. My notes include s...
CIE A-level Biology: Classification, Biodiversity and Conservation (A*)
CIE A-level Biology: The nervous system (A* achieved)
CIE A-level Biology: Plant Hormones (A* achieved)
All for this textbook (9)
Written for
CIE A2 Biology
All documents for this subject (9)
Seller
Follow
soniachow
Content preview
Gene control
the
ability of a cell to control /
regulate what proteins it mokes from its DNA .
repressor protein tact gene
-
.
bind
↳ to the
promoter
DNA / other
regions of regions
involving the regulation of gene
expression
Repressible Enzymes : produced continuously because me gene met codes for them are always switched on and
expressed .
→
Usually involved in anabolic
pom ways emoting )
→ CRE ] Can decrease if [ products of reaction
they cdtolyse ] P .
↳ can bind to In allosteric site
of inactive repressor protein
I
activated repressor binds to the OPERATOR
prevents RNA /
polymerase binding progressing
=
21mg DNA ↳
by binding to me promoter region
.
[ P ] b this is reversed 2nd transcription
Temporary When
=
,
continuous .
Inducible Enzymes produced met codes switched
only
:
when the
gene for them are on because of
presence of 2 specific molecule substrate
me eg
hey
.
.
lot operon enzymes ( 2
,
Y
,
A)
12%
Structural genes : codes for me synthesis of polypeptides →
proteins DNA )
Regulatory genes :
controls the structural genes 198-1 .
of DNA )
↳
gene regulation con T or t the
production of d
hummus gene expression specific protein
M where RNA
polymerase
will b
Regulatory sequence : consists of DNA operator &
regulatory , promoter region
ls switch on 10A
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 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 soniachow. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £8.55. You're not tied to anything after your purchase.
