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Nucleic Acids
Biology Unit 2
Molecules, food and health…read more

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· Contains genetic information.
· DNA molecules are long and coiled up tightly
so a lot of genetic information can fit in a
small space.
· Has a paired structure which makes it easier
to copy itself (self replication).
· Contains genes which code for specific amino
acid sequences that form proteins.…read more

Slide 3

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· DNA is a polynucleotide-made up on lots of
nucleotides joined together.
· Nucleotides are made up of a phosphate
group, a deoxyribose sugar, and a base which
· Four bases are adenine, thymine, cytosine and
guanine. Adenine & guanine are purines,
cytosine and thymine are pyrimidine's.…read more

Slide 4

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DNA-Nucleotides…read more

Slide 5

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DNA-Double Helix
· Nucleotides join together to form
polynucleotides, they bond between the sugar
and the phosphate group.
· Polynucleotides join together by hydrogen
bonding between the bases. (C-G and A-T).
· Two antiparallel (running in opposite
directions) polynucleotide strands twist to
form the DNA double helix.…read more

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DNA-Double Helix…read more

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