Question

Invention of Single Stranded DNA
When was single stranded DNA found?

Answer 1

DNA was first isolated by the Swiss physician Friedrich Miescher who, in 1869, discovered a microscopic substance in the pus of discarded surgical bandages. As it resided in the nuclei of cells, he called it "nuclein".[178][179] In 1878, Albrecht Kossel isolated the non-protein component of "nuclein", nucleic acid, and later isolated its five primary nucleobases.[180][181] In 1919, Phoebus Levene identified the base, sugar and phosphate nucleotide unit.[182] Levene suggested that DNA consisted of a string of nucleotide units linked together through the phosphate groups. Levene thought the chain was short and the bases repeated in a fixed order. In 1937, William Astbury produced the first X-ray diffraction patterns that showed that DNA had a regular structure.[183]

Answer 2

Answer:

Single-stranded DNA (ssDNA) viruses are widespread in the environment and include economically, medically, and ecologically important pathogens.

Ex: HIV

DNA was first isolated by the Swiss physician Friedrich Miescher who, in 1869, discovered a microscopic substance in the pus of discarded surgical bandages.