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Nucleotide Structure
Nucleotides (monomers) bond to
produce a polynucleotide.
Nucleotides have three parts-
O Phosphate
O Pentose sugar (Deoxyribose)
O Organic base (Nitrogenous base)
The phosphate of one nucleotide forms
a strong covalent bond with a pentose
sugar of another nucleotide.
This chain of nucleotides produces one
strand of DNA.…read more

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Pairing of Bases
The bases of one DNA strand create weak
hydrogen bonds with the bases of another
A only creates a bond with T
C only creates a bond with G.
This is known as complementary base pairing.
(A= Adenine, T=Thymine, C=Cytosine, G=Guanine.…read more

Slide 4

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DNA combined
with protein
beginning to
unravel…read more

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Function of DNA
DNA is the hereditary material responsible for passing
genetic information from cell to cell.
It's adapted to perform its functions in a number of
O Very stable, avoiding mutation when passed
between cells and generations
O In two separate strands allowing replication and
protein synthesis
O Carries a lot of information in a compact way
O Genetic material protected by deoxyribose-
phosphate backbone…read more

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DNA replication
1. DNA helicase causes the two strands of DNA to
2. Free nucleotides are attracted to their
complementary bases
3. DNA polymerase joins the nucleotides to the
4. Once all the nucleotides have been joined to
the original strand, a complete polynucleotide
is formed
As this polynucleotide has half the original DNA
material, this method of replication is called semi-
conservative method
Click here for an animated explanation of
replication :)…read more


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