Question

Who is credited with the discovery of DNA?

• A. James Watson
• B. Francis Crick
• C. F. Miescher
• D. Rosalind Franklin

Hint:

Friedrich Miescher discovered DNA in 1869 and originally named it “nuclein” because it was isolated from the cell nucleus.

Answer 1

The Correct Option is C

Concept: DNA (Deoxyribonucleic Acid) is the hereditary material responsible for storing and transmitting genetic information in living organisms. The discovery of DNA laid the foundation for modern genetics and molecular biology.

Step 1: Historical discovery.
DNA was first discovered in 1869 by the Swiss scientist Friedrich Miescher. While studying the nuclei of white blood cells obtained from pus on surgical bandages, he isolated a new phosphorus-rich substance.

Step 2: Naming of the substance.
Miescher called this substance “nuclein” because it was found in the cell nucleus. Later research identified this material as DNA.

Step 3: Later contributions.
Many scientists contributed to understanding DNA:
• Watson and Crick proposed the double helix structure.
• Rosalind Franklin provided crucial X-ray diffraction data. However, the initial discovery of DNA itself is credited to Friedrich Miescher.

Step 4: Conclusion.
Thus, the scientist credited with the discovery of DNA is F. Miescher.