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DNA
DNA (DEOXYRIBOSE) has a nucleotide structure consisting of




There are two different types of organic bases:

1) single ring bases- cytosine and thymine

2) double ring bases- adenine and guanine



The nucleotide structure forms by a condensation reaction


DNA STRUCTURE

DNA has a double helix structure which are joined…

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FUNCTION OF DNA

DNA is a very stable molecule which allows it to be passed from generation to generation without
change.

The two separate strands are joined with Hydrogen bonds which allows the to separate during DNA
replication

DNA is a very large molecule and so contains lots of genetic…

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MEIOSIS

Meiosis produces four daughter cells. Each cell contains half the number of chromosomes as the
parent cells.

Meiosis involves two nuclear divisions:

first division

The homologous chromosomes pair up and their chromotids wrap around each other. Crossing over
occurs where portions of chromotids are exchanged




Each one of these…

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THE REPLCATION OF DNA

DNA replicates by a process called semi-conservative replication

1. DNA helicase unzips the 2 strands of DNA

2. Free activated nucleotides are attracted to their complementary bases

3. DNA polymerase rejoins the strand

4. 2 identical strands are formed

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