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  • Created by: Samantha
  • Created on: 09-03-13 15:09

Genetic Code and Cell Function

DNA has two main functions in the cell:

  • REPLICATION in dividing cells


DNA replication takes place during INTERPHASE, in replication:

The hydrogen bonds between the base pairs break and the two halves of the molecule seperate causing the DNA to UNWIND. As the strands seperate, the enzyme DNA POLYMERASE catalyses the addition of free nucleotides to the exposed bases. If a DNA polymerase inhibitor was added to the cell, the nucleotides would still match up to their complementary nucleotides on the original DNA strand but they wouldn't be able to join together to form a new strand. Each chain acts as a TEMPLATE (Blue Print from which a copy is made) so that the free nucleotides can be joined to their complementary bases. The result is two DNA molecules, each made up of one newly synthesised


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