In I/GCSE Biology, this part will discuss the basic information of DNA and the discovery of DNA.

• In I/GCSE Biology, a DNA molecule has two strands coiled together in the shape of a double helix.
• The stands are held together by bases. There are four different bases:
  • Adenine
  • Cytosine
  • Guanine
  • Thymine

• The bases are always paired:
• A - T
• C - G

• The base pairs are joined together by weak hydrogen bonds.
• A gene is a section of DNA, and the sequence of bases in a gene code for a specific protein.

• Rosalind Franklin and Maurice Wilkins worked out that DNA had a helical structure by directing beams of x-rays onto crystallised DNA.
• James Watson and Francis Crick used these ideas, along with the knowledge that the amount of adenine and guanine matched the amount of thymine and cytosine, to make a model of the DNA molecule.

That's all~~

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