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DNA is a polymer of nucleotides & so is a polynucleotide.

Nucleotides are made up of:

a phosphate.
a sugar - deoxyribose.

a base - either adenine, guanine, thymine or cytosine




The nucleotides are arranged in two chains which are coiled
into a spiral shape called a double helix.






DNA…

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are called Adenine, Guanine, Thymine and Cytosine. (A,G,T
and C for short).

The nucleotides are joined in a specific order. The order of
the nucleotides means that the bases they contain are in a
certain order, it is this order which forms the genetic code.




This




sugar-phosphate-sugar bond is called…

Page 3

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and not all of them are active. Within any given cell, some
genes will be "on" or "off."

When a gene is "on," it is making proteins or RNA
products and affecting the functioning of the organism in
some way. If a gene is "on," scientists consider that it is…

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