B2: DNA

Description

GCSE Biology (B2: The Components of Life) Mind Map on B2: DNA, created by Sarah Knox on 22/02/2017.
Sarah Knox
Mind Map by Sarah Knox, updated more than 1 year ago
Sarah Knox
Created by Sarah Knox almost 8 years ago
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Resource summary

B2: DNA

Annotations:

  • Function of DNA = instruction for body to make protein
  1. Structure of DNA

    Annotations:

    • Double helix.  Sugar phosphate backbones, two strands twisted together.  4 complimentary bases joined by weak hydrogen bonds.  Bases only pair: A+T and C+G
    1. Adenine
      1. Thymine
        1. Cytosine
          1. Guanine
          2. Discovery of DNA
            1. Rosalind Franklin and Maurice Wilkins

              Annotations:

              • Studying DNA using x-ray crystallography (1950s London).  Patterns recorded allowed Rosalind Franklin to work out how the groups of atoms in the DNA were arranged (double helix). 
              1. James Watson and Francis Crick

                Annotations:

                • Watson & Crick used x-ray results to build a 3D model of the DNA structure without permission.  Eventually contributions made by Franklin and Wilkins became clear and Wilkins, Watson and Crick won the Nobel Peace Prize in 1962 for discovering structure of DNA.  Franklin died 4 years earlier aged 27. 
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