EDEXCEL A SNAB
:
-
T L
⑯ essa
These are A* quality notes that I wrote during my A Levels to help me revise
for A Level Edexcel A SNAB Biology. Notes and resources for this exam
board are very limited so I hope these notes help students that are
struggling to find resources online. I wrote these using my class notes, the
Edexcel SNAB textbook, mark schemes and other online resources such as
savemyexams. At the end of the document, I have written some common
exam questions that I came across during my revision along with their mark
scheme points so you can see which points are important to revise. Once
you have read through topics, I’d highly recommend doing exam questions
and trying to finish the specification as soon as possible so you can do as
much exam prep as possible. I hope these notes are useful for you as they
were for me and I wish you luck in your studies!
https://notesbyprabs.etsy.com
, ·
mononucleotide
Hydrophilic
Phosphate group
.
↓
a-
--
1
-
↑
Hydrophobic
↑ Nitrogencus base
pentose
sugar
·
mononucleotides link together by condensation reactions
blu sugar of 1 & phosphate of the next=
poly nucleotide
·
Band-->phosphodiester band
·
DNA-decxynbosenucleic acid
↳ 2 polynucleic strands which run in
opposite
directions
↳ Bases held by hydrogen bands
lgether in
pairs
Hydrogen
· A Bund T
↓ -O
x-i --
Wt - Phosphodiester
- -
- -
L
- band
Hydrophilic -> ox-
G C
/
Phosphate &
- ..... iT -
Y-
%
2
groups
autride ex T . . .
It 1
-
-
F
Hydrophobic bases on inside
Guanine]
Adenine 2
Ring
Structure one 1 Ring
, DNA VS RNA
Double stranded
·
stranded ·
Single
·
Deoxyribonucleic acid · Ribmudeic acid
mononucleotides mononucleotides
·
Deoxyribose · Ribose
·
ATGC bases · vacil replaces Thymine
·
Very Hable double helix ·
Unstable & easily
breaks up
ATP VS DNA
-> Both contain phosphate , pentose sugar a base
· Ribose ·
Decxynbose
·
3 phosphates ~
I phosphate .
PROTEIN SYNTHESIS
Stage 1 Transcriptuch
:
2) RNA
polymerase binds 6 DNA
2) DNA unwinds & H bands blu complementary strand
broten
Antisense/template Strand used for mRNA synthesis
3)
4) RNA polymerase used b jain RNA nucleotides
3) complementary base paining of A with v not I ,
6) mRNA leaves nucleus through pare in nucleur
envelope .
Stage 2
:
Translation
1) Ribosomes attaches to MRNA
2) tRNA carries an amino acid
:
-
T L
⑯ essa
These are A* quality notes that I wrote during my A Levels to help me revise
for A Level Edexcel A SNAB Biology. Notes and resources for this exam
board are very limited so I hope these notes help students that are
struggling to find resources online. I wrote these using my class notes, the
Edexcel SNAB textbook, mark schemes and other online resources such as
savemyexams. At the end of the document, I have written some common
exam questions that I came across during my revision along with their mark
scheme points so you can see which points are important to revise. Once
you have read through topics, I’d highly recommend doing exam questions
and trying to finish the specification as soon as possible so you can do as
much exam prep as possible. I hope these notes are useful for you as they
were for me and I wish you luck in your studies!
https://notesbyprabs.etsy.com
, ·
mononucleotide
Hydrophilic
Phosphate group
.
↓
a-
--
1
-
↑
Hydrophobic
↑ Nitrogencus base
pentose
sugar
·
mononucleotides link together by condensation reactions
blu sugar of 1 & phosphate of the next=
poly nucleotide
·
Band-->phosphodiester band
·
DNA-decxynbosenucleic acid
↳ 2 polynucleic strands which run in
opposite
directions
↳ Bases held by hydrogen bands
lgether in
pairs
Hydrogen
· A Bund T
↓ -O
x-i --
Wt - Phosphodiester
- -
- -
L
- band
Hydrophilic -> ox-
G C
/
Phosphate &
- ..... iT -
Y-
%
2
groups
autride ex T . . .
It 1
-
-
F
Hydrophobic bases on inside
Guanine]
Adenine 2
Ring
Structure one 1 Ring
, DNA VS RNA
Double stranded
·
stranded ·
Single
·
Deoxyribonucleic acid · Ribmudeic acid
mononucleotides mononucleotides
·
Deoxyribose · Ribose
·
ATGC bases · vacil replaces Thymine
·
Very Hable double helix ·
Unstable & easily
breaks up
ATP VS DNA
-> Both contain phosphate , pentose sugar a base
· Ribose ·
Decxynbose
·
3 phosphates ~
I phosphate .
PROTEIN SYNTHESIS
Stage 1 Transcriptuch
:
2) RNA
polymerase binds 6 DNA
2) DNA unwinds & H bands blu complementary strand
broten
Antisense/template Strand used for mRNA synthesis
3)
4) RNA polymerase used b jain RNA nucleotides
3) complementary base paining of A with v not I ,
6) mRNA leaves nucleus through pare in nucleur
envelope .
Stage 2
:
Translation
1) Ribosomes attaches to MRNA
2) tRNA carries an amino acid
