Opioids and Heroin Binding — NEET Biology
✅ Asked in NEET 2023Match List-I with List-II: (NEET 2023) List-I: A. Smack B. Charas C. Cocaine D. LSD List-II: I. Cannabis sativa II. Diacetylmorphine III. Claviceps purpurea IV. Erythroxylum coca Choose the correct answer from the options given below:
Match List-I with List-II: (NEET 2023) List-I: A. Smack B. Charas C. Cocaine D. LSD List-II: I. Cannabis sativa II. Diacetylmorphine III. Claviceps purpurea IV. Erythroxylum coca Choose the correct answer from the options given below:
Diacetyl morphine is also called as: (NEET 2023)
The drug called ‘Heroin’ is synthesized by (NEET 2019)
Which part of poppy plant is used to obtain the drug “smack”? (NEET 2018)
Answer & NCERT explanation
Correct answer: D — A-II, B-I, C-IV, D-III
Without seeing the lists in the question, this appears to be a matching question about biological concepts. Based on the answer being option (d) A-II, B-I, C-IV, D-III, this represents a specific matching pattern between two lists of related biological terms or processes. The correct matching would depend on understanding the relationship between corresponding items in List I and List II.
Read more NCERT concept on the PYQ
Opioids are the drugs, which bind to specific opioid receptors present in our central nervous system and gastrointestinal tract. Heroin, commonly called smack is chemically diacetylmorphine which is a white, odourless, bitter crystalline compound. This is obtained by acetylation of morphine, which is extracted from the latex of
NTA tests understanding that opioids like heroin bind to specific receptors in the CNS and GI tract, acting as depressants that slow body functions. Students often confuse heroin's chemical structure (diacetylmorphine) with its mechanism or forget that it's derived from morphine through acetylation. The key trap is mixing up depressant effects with addiction potential—both matter, but NTA focuses on receptor binding and CNS depression. Remember: heroin is obtained by acetylating morphine from poppy latex, and this binding to specific receptors is what causes its depressant effects on the body.
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Through deep analysis of NEET and NTA, 88 of 90 questions from the NEET 2026 paper were matched straight from the MedicNEET Biology question bank.
88/90MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.