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Revision, DNA Structure, DNA Structure, Organisation of DNA, Organisation…
Revision
DNA Structure
Organisation of DNA
DNA Structure
Deoxyribose Nucleic Acid
Double helix
Sugar phosphate strands
Held together by
weak
hydrogen bonds
3' Phosphate end
5' Sugar end
Nucleotides
Found in the nucleus
Leading strand
Lagging strand
DNA polymerase
Primers
DNA Structure
DNA - Deoxyribonucleic Acid
DNA nucleotide
Chemical bond
forms between the phosphate group and the 3' of the sugar
Sugar Phosphate
Backbones
Nucleotides bind to the 3' end
A - T / / / / C - G
Weak hydrogen bonds hold two separate DNA strands together until the need to break
Anti-parallel Strands
Organisation of DNA
Prokaryotes
Yeast, Bacterial cells
Circular chromosomes
Eukaryotes
Linear Chomosomes
Animal, Plant cells
Organisation of DNA
Eukaryotes
Linear chromosomes
Tightly coiled
Animal, Plants &
Fungi (yeast)
cells
Histones
Yeast
contains circular plasmids also
Prokaryotes
Circular chromosomes
Smaller circular plasmids
Bacteria cells
Unit One