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Unknown Story
Updated: 9/28/2020
Unknown Story
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Storyboard Text

  • Before the DNA replication can even start, the double strand molecule must be "unzipped" into two single strands.
  • Adenine, thymine, cytosine, and guanine are the four bases that forms the pairs between the two strands.
  • The enzyme, helicase, breaks the hydrogen bonds that connected the two strands, which allowed them to come apart. This separation creates a "Y" shape called a replication fork
  • DNA is semi-conservative because it would produce two copies that each had one of the original strands and one new strand.
  • One of the strands is aligned in the 3' to the 5' direction, which is the leading strand. Theother strand is aligned in the 5' and 3', which is the lagging strand. Because these are different Alignments, these two strands are replicated differently.
  • Replicating the leading strand is the easiest to do. A short piece of RNA called a primer binds to the 3' end of the strand once the DNA strands have been separated. Primers are brought by the enzyme DNA primase.
  • Enzymes that are known as DNA polymerases are responsible for creating new strands by using a process called elongation.
  • Polymerase ||| is the main replication enzyme, while polymerase |, ||, |V, and V are responsible for error checking and repair. The lagging strand begins replication by binding with multiple binders. DNA polymerase then adds pieces of DNA, called Okazaki fragments, then adds to the the strand between primers.
  • One of the strands are aligned in the 3' to the 5' direction, which is the leading strand. The other strand is in the 5' to the 3' direction, which is the lagging strand. Because of their different alignment, the two strands are replicated differently.
  • Polymerase ||| is the main replication enzyme, while polymerase |, ||, |V, and V are responsible for error checking and repair. The lagging strand begins replication by binding with multiple primers.
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