Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. What role did Pauling and Chargaff, have in the developing the DNA model?
   • Before the discovery of the DNA structure, Pauling had already discovered helical proteins and Chargaff had already discovered there were always equal numbers of bases A and T and also equal numbers of C and G.
2. What role did Watson and Crick have in the developing the DNA model?
   • Watson and Crick worked out the shape of the DNA double helix and how it could be replicated.
3. What role did Franklin and Wilkins have in the developing the DNA model?
   • Franklin and Wilkins used the new technology of X-ray crystallography to make photographs of the DNA molecule and revealing its shape.
4. What factors are needed for scientific understanding to progress?
   • The factors needed for scientific understanding to progress including the improvements in technology and building on discoveries by other scientists.