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  • WWW: Good effort EBI: Everything
  • DNA Replication Test
  • Come see me
  • F
  • So what did you get on the test? :)
  • I'm going to give you a retest... what happened? You're usually much better than this!
  • I dunno... *shuffles shoes*
  • Well, you've got 3 days! Make sure to memorize the process!
  • Oh M. Boney, what do I do? I don't even know what DNA is ;(
  • the closet...
  • Chill...I'm here to help you.
  • Hehe this is kinda humerus.
  • DNA is a double-stranded helix. Like a ladder, but twisted. There are 4 nitrogenous bases and their bonds make up the 'rungs'
  • These pairs of bases form hydrogen bonds - the rungs. These are not easily broken - like love, 'till death do us part'.
  • The first pair here are adenine and thymine, and the second pair is guanine and cytosine. (medieval age = purines and greek = pyrimidines)
  • When DNA replicates, however, the hydrogen bonds must be broken. So the enzyme helicase comes and breaks them.
  • Now there are 2 separate strands. These will act as templates for new DNA.
  • 5'
  • 3'
  • Oops. I forgot to tell you earlier, but these strands have different orientations. Let me adjust the diagram for you.
  • 5'
  • 3'
  • 1 strand is oriented in the 3’ to 5’ direction (towards the replication fork). This is the 'leading strand'. 1 strand is oriented in the 5' to 3' direction. This is the 'lagging strand'.
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