Dna Structure Flashcards Preview

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

Flashcards in Dna Structure Deck (4)
1

Structure

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

2

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

3

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

4

Ends of the polynucleotide strand

One has phosphate group

Other had hydroxyl group arrcahed to sugar


Anitparallel