James Watson and Francis Crick gave a double strand helix structure for DNA. Two Nucleic acid chains are wound about each other and held together by hydrogen bonds between pairs of bases. The two strands are complementary to each other because the hydrogen bonds are formed between specific pairs of bases. Adenine forms hydrogen bonds with thymine whereas cytosine forms hydrogen bonds with guanine.
Some of the drugs are considered very harmful and are known to affect Nucleic acids RNA and DNA. Out of the following, which one is known to be banned?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Phenacetin
Phenacetin was once used as an analgesic and antipyretic, but it was found to be harmful (kidney damage and a cancer risk with long use) and has been banned in many countries, including India. Its metabolite paracetamol is used instead.
Note: The question is from beyond the NCERT textbook, and it is also out of the CUET 2026 syllabus.