Assignment:
Answer the following questions:
1. Who was a Swiss physician who was the first to extract DNA from cells and identify it as a unique chemical substance?
2. Who analyzed nucleins, now known as DNA and discovered key components including the nitrogenous bases adenine, thymine, cytosine, guanine, and uracil?
3. Who discovered ribose, the 5-carbon sugar in RNA, and deoxyribose, the 5-carbon sugar in DNA and also determined how the nucleic acid components combine to form the nucleotides. He is best remembered for an incorrect hypothesis, the tetranucleotide hypothesis.
4. What discovery was made by Frederick Griffith? Explain what this is. When he first set out to perform these experiments, was this his original intent? Explain.
5. What was the contribution of Oswald Avery to DNA research?
6. Who were the two researchers who performed the "blender experiment"? What were the conclusions of the experiment?
7. What was the contribution of Erwin Chargaff to DNA research?
8. Who was an English physicist and molecular biologist who took X-ray diffraction photographs of DNA that motivated James Watson to begin working on DNA? He later shared the Nobel Prize with Watson and Crick.
9. Who took the X-ray diffraction photograph of the B-structure of DNA that was given to James Watson and convinced him that the structure of DNA was helical?
10. Summarize the contribution of James Watson and Francis Crick to DNA research.
Attachment:- The History of DNA- the Genetic Material.rar