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8.1 Structure of DNA

Why do living organisms vary?
How this variation is influenced by genetic and environmental factors

Nucleotide structure:

Made up of three sections:

1. A sugar called deoxyribose
2. A phosphate group
3. An organic base belonging to one of two different groups:
a) Single-ring bases

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Phosphate and deoxyribose wind round one another to create the double helix. For each turn
there are 10 base pairs.

DNA is the material responsible for passing on genetic information from cell to cell

3.2 billion base pairs in the DNA in a typical mammalian cell almost infinitive number of…


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