Summary Cellular Control revision notes for biology A level OCR
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Course
Cellular control
Institution
OCR
Book
A Level Biology A for OCR Student Book
In depth revision notes covering the whole of cellular control. The topic is broken down into the individual specification points, shown by the numbers used throughout.
OCR A Biology H420 - 2.1.5 - Biological Membranes (Chapter 5) Short Summary Notes
Respiration notes or OCR biology A level
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Cellular control
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, 6 1 1 CELLULAR CONTROL . .
Typesofge are
mutation
= change to the base nucleotide
sequence
·
substitution -
I bases are swapped for
base
another
·
Deltion- > I bases are removed
Insertion- > I bases are added
·
If a mutation occurs in a gene ,
the
Primary structure could be altered .
This
would then -
change the tertiary structure , so
the prote wouldn't work. Mutations
could also cause the protein to not be
Produced at all
RNA editing :
It
changes the sequence of nucleotides through
Insertion , deletion or substitution
. This causes
the synthesis of different protects .
4 So
,
it increases the range of proteins that can
be produced from a
single mRNA molecule or
gene
Effects :
·
Reversible -
single als constantly durn out
Copies of
RNA
·
could be used wi humans to treat genetic
diseases without the long-term risks of
permenant DNA editing with CRISPR
chromosome mutation change to -
structure of chromosome deletion , -
inversion translocation
. > translocation -
swaps the legs arounddromosomes S
affecting the way that the genes are
switched on
·
mutations occur during DNA replication
before all division
↳ If they occur mitosis
before
, they're
somatic
↳ If
L
they
<
occur before meiosis , they're
wherited
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