genetics 2
Storyboard Text
- Slide: 1
- To find out what part of the bacteria is responsible for the transformation, we just have to add 3 different enzymes into three different tubes containing the heat killed S-Strain and the R-Strain.
- We use RNase, breaking down RNA, DNase, breaking down DNA and protease, what breaks down protein.
- After mixing each of the enzymes with the bacteria, only the tube with DNase contained transformations, what means DNA has to hold the genetic information.
- Slide: 2
- To validate the experiments about DNA, we can use bacteria phages, a virus that infects bacteria. We include one phage with DNA and one with protein, and label the phages with two different radioactive atoms to track them. When a phage infects a host bacterium, it attaches itself to the walls and enters it later. Then, a piece of the phages enters the bacterium and subsequently replicate itself.
- As we can see, only the phage containing DNA was able to fulfill the process of replication. That is another proof of how DNA holds genetic information.
- Slide: 3
- I can see a dark X line at the DNA using X-Ray crystallography. The DNA might be structured as a Helix with the bases in the outside and the sugars etc. in the inside.
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