LOCATION OF DNA

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 Location of DNA:
 Present in the nucleus (nuclear DNA) – makes up genes on chromosomes
 Present in mitochondria (mitochondrial DNA)
 Present in chloroplasts (plants)

 Brief history of the discovery of the DNA molecule (Watson & Crick, Franklin & Wilkins)

 Structure of DNA
 The natural shape of the DNA molecule is a double helix
 Each strand of the helix is made up of a sequence of DNA nucleotides

 Three components of a DNA nucleotide:
 Nitrogenous bases linked by weak hydrogen bonds:
o Four nitrogenous bases of DNA: adenine (A), thymine (T),
cytosine (C), guanine (G)
o Pairing of bases in DNA occur as follows: A: T and G: C
 Sugar portion (deoxyribose in DNA)
 Phosphate portion