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DNA - Nucleotide
Phosphate
Base (Made from
Pentose mainly Nitrogen)
Sugar
(Deoxyribose
4 Bases:
)
5 Carbons
Adenine
Thymine
Cytosine
Guanine…read more

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DNA
A T
Covalent
Bond
C G
Hydrogen Sugar-
T A
Bonds Phosphate
Backbone
T A
REMEMBER!
A­T
C-G G C…read more

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3 Important Features
Stable:
Strong Covalent bonds in Sugar-Phosphate
Backbone
Lots of Hydrogen bonds
Provides Information:
Long Molecule
Base sequence provides cell with information for
certain genes
Coiled, Compact shape.
Can Replicate…read more

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DNA Replication
Asexual Reproduction
Make new cells ­ Growth and Repair
1. DNA splits, top to bottom
2. DNA helicase attaches to the DNA and moves along its length
3. Hydrogen bonds between bases are broken, the strands separate and
unzip
4. Free nucleotides from the nucleoplasm are attracted to their
complementary bases on each of the separated strands
5. Nucleotides bond together via DNA polymerase
6. Two identical DNA molecules are formed
7. Each new DNA molecule consists of one newly synthesised strand and
one original strand
8. Semi-Conservative replication…read more

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QUESTION!
Describe the structure of DNA and explain how a
sequence of DNA is replicated. (9 marks)
2 Strands
Nucleotides
Deoxyribose Sugar, Phosphate, Base (Nitrogen)
4 Possible bases ­Pair Up A-T and C-G
Covalent bonds between phosphates
Strong Sugar-Phosphate Backbone
Hydrogen bonds between phosphates
DNA Helicase unzips the two strands breaking H bonds
Free nucleotides attracted to complementary bases
DNA polymerase helps bond the new nucleotides
Identical molecules
Semi-conservative replication…read more

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