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DNA, RNA and Protein Synthesis - Biology - Alevel > Dna Structure > Flashcards

Flashcards in Dna Structure Deck (4)
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Composed of 2 polynucleotide strands which wind around eachother to form double helix

Really long and coiled up tightly so a lot of genetic information can fit into small space


Dna Nucleotide structure

Phosphate group
Pentose sugar known as deoxyribose
Nitrogen base.

Each dna molecule has the same sugar and phosphate but different base
Adenine thymine guanine cytosine


How to 2 dna polynucleotide strands join together ?

By hydrogen bonds between basses
A-T 2 hydrogen bonds
G-C 3 hydrogen bonds
Equal amounts of each base


Ends of the polynucleotide strand

One has phosphate group

Other had hydroxyl group arrcahed to sugar