Higher Human Biology Unit 1 – Human Cells

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Presentation transcript:

Higher Human Biology Unit 1 – Human Cells DNA Structure Higher Human Biology Unit 1 – Human Cells

Location of DNA

Double Helix Structure

Nucleotides

Bases 4 bases Base pairing rule Adenine (A) Thymine (T) Cytosine (C) Guanine (G) Base pairing rule A pairs with T C pairs with G

Sugar Phosphate Backbone Weak Hydrogen Bonds

Deoxyribose Sugar

Antiparallel Strands 5’ 3’ P O 1 2 3 4 5 P O 1 2 3 4 5 G C T A 3’ 5’

DNA packaged as chromosomes DNA is located in nucleus of cell It is extremely long and threadlike It is wrapped around tidy protein ‘spools’

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