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MCQ Questions for Class 12 Biology Set 4

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1. Which is not component of lac operon:




2. Okazaki fregments is:




3. Transposons occur in:




4. One of these is not prepared directly from DNA




5. Coiling of DNA duplex is:




6. DNA double helix model was given by:




7. Inprokaryotic translation, GTP molecule required in at:




8. DNA transcription, if nucleotide sequence of DNA strand, that is being coded in ATACG, then the nucleotide sequence in m-RNA would be:




9. In a m-RNA, how many nucleotide sequence code for amino acid:




10. RNA from which has clover leaf model:




11. Nitrogenous bases present in DNA:




12. Missing link in evolution is:




13. Hardy-Weinberg principle explains :




14. As per Neo-Darwinism, which is mainly responsible for evolution?




15. Dispersal of population depends on:




16. Evolutionary history of an organism is known as:




17. Book ‘Philosophique Zoologique’ was written by:




18. Which one of the following phenomenon supports Darwin’s concept of natural selection in organic evolution?




19. The biogenetic law of Haeckel is:




20. Wings of Butterfly and birds are:




21. Theory of Pangenesis was given by:




22. Pain-killer drugs:




23. AIDS caused by:




24. Immune deficiency symdrome is caused by:




25. Opium is:




26. AIDS occur by which cause?




27. Heroin is the form of :




28. Caffein, Amphetamine and coceins are:




29. Following is Hallucinator




30. World AIDS day is:




31. By the plant of which family Heroin is obtained?




32. Opiates are obtained from




33. PCR is test for:




34. Following which is STD:




35. Wuchereria bancrofti causes filaria in human being. It is of which group:




36. Which organ of body is most affected by excessive intake of alcohol?




37. Common cold is caused by:




38. Which of the following is the cancer of blood?




39. Gonorrhoea is caused by:




40. Antigen-binding site in an antibody, is found between:




41. Alcohol is the most socially accepted narcotic drug. Excessive consumption of alcohol leads to:




42. Disease associated with secretion of toxin is:




43. Widal test is done to confirm:




44. Which part of poppy plant yields opium:




45. Kala-azar is transmitted by:




46. Memory cells are formed from:




47. BCG vaccine is a preventive measure against:




48. Antigens are present:




49. The disease, tetanus also known as:




50. Man in the life-cycle of plasmodium is: