DNA Replication Cartoon
Storyboard Text
- Today we are going to learn about DNA Replication. There are three steps to DNA replication. The first step is for the DNA strands to split. The hydrogen bonds are broken. The enzyme helicase makes this happen.
- DNA Replication
- The second step of DNA Replication is new nucleotides are added to each strand by DNA polymerase. When the DNA is split in step one new matches have to be added. Remember, A pairs with T, and C pairs with G.
- DNA Replication
- In step two when the new strands are added on, one is an old strand and one is a new strand. This is called semi-conservative. When the new strands are added they can only be added in the 5' to 3' direction. So, the top strand is added all together going forward but the bottom strand has to be added in sections going backwards.
- DNA Replication
- In the third step all bonds are re-formed by DNA ligase. This reconnects all the hydrogen bonds together and finishes the process of DNA Replication.
- DNA Replication
- So, DNA Replication takes place in three steps. The first step is the strands are split and the hydrogen bonds are broken.
- Right! And that happens because of the enzyme helicase.
- The second step is new strands are added to the old strands that were split by DNA polymerase. And A pairs with T, and C with G.
- The third step is the bonds are re-formed by DNA ligase. This connects all the hydrogen bonds and finishes the process.
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