DNA replication

• Why must cell replicate dna?

  so that each daughter cell receives an exact copy of the genetic information
• where does dna replication take place

  nucleus
• during what phase does DNA replication take place in the nucleus

  interphase
• what might the cell need in order to copy DNA

  the original DNA molecule , free nucleotides , DNA helicase DNA polymerase and a source of energy
• what is the first stage of DNA replication

  the DNA unwinds
• what happens in DNA replication after the dna unwinds

  the hydrogen bonds holding the complementary base pairs together break causing the 2 strands to separate
• what is used to break the hydrogen bonds during DNA replication

  helicase
• what happens in DNA replication after the two stands separate

  each stand acts as a template
• what happens in DNA replication after the templates are formed

  free nucleotides align opposite their complementary bases
• what happens in DNA replication after the complementary bases begin to align

  DNA polymerase catalyses the condensation reaction Between the 2 DNA nucleotides
• where does the condensation reaction take place on the DNA nucleotides

  from the 5 prime to the 3 prime end of the chain
• what happens in DNA replication after the condensation reaction takes place

  one newly synthesised stand and one original stand form a new dna molecule
• what is meant by semi conservative DNA replication

  the DNA molecule produced is made of both a newly synthesised DNA molecule and a original DNA molecule
• what is meant by conservative DNA replication

  the DNA molecule produced would remain unchanged while being copied in the cell
• what is meant by dispersive DNA replication

  the DNA molecule produced would consist of an original stand and a newly synthesised stand reassembled randomly
• what does helicase do to the double helix structure

  it will unzip it by breaking the hydrogen bonds between the nitrogenous bases
• What does DNA polymerase do?

  adds base pairs to DNA during replication