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B
1912
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C
1931
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D
1953
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Solution
The correct option is A 1869 Nucleic acids are biopolymers or small biomolecules essentially to all known forms of life. They are composed of nucleotides which are the monomers made of three components: a 5 carbon sugar, a phosphate group, and a nitrogenous base. Nuclein was discovered by Friedrich Miescher in 1869.