Who discovered DNA?
Correct answer: A. Frederick Miescher
- A. Frederick Miescher
- B. Frederick Sanger
- C. Frederick Griffith
- D. Frederick Aldrich
Explanation
Frederick Miescher, a Swiss chemist, is credited with the discovery of DNA in 1869 when he isolated a substance he named 'nuclein' from the nuclei of cells. This substance was later understood to be DNA. The other options refer to scientists associated with different contributions to biology and genetics. Frederick Sanger developed methods for sequencing DNA, Frederick Griffith discovered the transforming principle, and Frederick Aldrich is not relevant to this context.
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About Biological Molecules
The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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