Summary CIE A-level Biology: Selection and Evolution (A* achieved)
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Course
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...
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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
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