Molecular Basis of Inheritance

Bihar Board Class 12 · Biology · 70 past questions

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1. Q1 2026 Set A

   Which of the following enzymes causes lactose to enter the bacterial cell ?

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2. Q2 2026 Set A

   Who stated that in double stranded DNA sum of purine nitrogenous bases is equal to the sum of pyrimidine…

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3. Q3 2026 Set A

   A typical nucleosome is composed of

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4. Q4 2026 Set A

   What did Hershey and Chase conclude on the basis of their experiments?

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5. Q5 2026 Set A

   What is the process of removal of introns and mutual joining of exons called?

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6. Q6 2026 Set A

   Which of the following statements is incorrect about the genetic code ?

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7. Q7 2026 Set A

   Who of the following scientists observed that restriction endonuclease can cut DNA strands in a particular…

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8. Q8 2026 Set A

   Cutting DNA at a specific site is made possible by which enzyme?

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9. Q9 2026 Set A

   The base pillar of both strands of DNA double helix is made of

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10. Q10 2025

    Which pentose sugar is present in RNA?

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11. Q11 2025

    Due to which of the following reasons there is approximately equal distance maintained between two…

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12. Q12 2025

    Which of the followings is not the reason for stability of DNA?

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13. Q13 2025

    The DNA finger printing technique was initially developed by who among the following?

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14. Q14 2025

    At which of the following sites the repressor protein binds to lac operon?

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15. Q16 2024 Set E

    Which of the following enzymes is responsible for transcription of ribosomal RNA?

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16. Q17 2024 Set E

    Some amino acids are coded by more than one codon. Such code is known as

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17. Q18 2024 Set E

    What is the role of y gene in lac operon?

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18. Q20 2024 Set E

    Who provided X-ray diffraction data of DNA?

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19. Q21 2024 Set E

    What was the conclusion of Hershey and Chase experiment?

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20. Q22 2024 Set E

    Which of the following is not a termination codon?

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21. Q23 2024 Set E

    What is the meaning of charging of t-RNA?

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22. Q24 2023

    What does operon model represent ?

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23. Q25 2023

    During which process Okazaki fragments are synthesized ?

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24. Q26 2023

    Termination codon is –

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25. Q27 2023

    DNA double helix is –

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26. Q28 2023

    Which enzyme is required in the process of transcription ?

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27. Q29 2023

    The mobile genetic element is –

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28. Q30 2023

    Who discovered the molecular structure of Insulin ?

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29. Q31 2022 Set A

    The DNA formed from RNA is called…

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30. Q32 2022 Set A

    Deoxyribose and ribose sugars belong to the same class, which are called.

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31. Q33 2022 Set A

    By what can the arrangement of DNA nucleotides be observed?

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32. Q34 2022 Set A

    When a solution piece of DNA is kept at 82°-90° C, then

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33. Q35 2021 Set H

    Anticodons are found in

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34. Q36 2021 Set H

    Purinc bases of DNA are

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35. Q37 2021 Set H

    Source of EcoRI enzyme is

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36. Q38 2021 Set H

    Pyrimidines present in RNA are

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37. Q39 2021 Set H

    Nucleoside is

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38. Q40 2021 Set H

    What does operon model represent?

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39. Q41 2021 Set H

    DNA is genetic material of

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40. Q42 2021 Set H

    A sequence of three bases on tRNA which binds to mRNA codon is

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41. Q43 2021 Set H

    Operon model was proposed by

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42. Q45 2020

    Which of the following is the initiation codon?

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43. Q46 2020

    Which of the following is a mobile genetic material?

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44. Q47 2020

    When does the Okazaki fragment form?

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45. Q48 2019

    Restriction enzymes are known as

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46. Q49 2019

    Lac operon represents

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47. Q50 2019

    Uracil is related to

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48. Q52 2019

    Synthesis of RNA on DNA template is knows as

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49. Q53 2019

    Differentiate between Euchromatin and Heterochromatin.

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50. Q56 2018

    The human chromosome with highest and least number of genes are…

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51. Q57 2018

    Which of the following is involved in transcription of tRNA, 5Sr RNA and Sn RNA of eukaryotes?

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52. Q58 2018

    Describe the two salient features of double Helix structure of DNA.

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53. Q59 2018

    Name any two (2) enzymes of DNA replication and mention one specific function of each of them.

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54. Q60 2018

    What is micro injection? How it is helpful in recombinant DNA technology?

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55. Q61 2017

    Operon Model is representation of-

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56. Q62 2017

    Which nitrogen base is absent in DNA?

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57. Q63 2017

    DNA is genetic material of-

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58. Q64 2017

    Formation of mRNA from DNA is called-

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59. Q65 2016

    Which DNA molecule below contains purine?

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60. Q66 2016

    Which bond exists between the nitrogenous bases of nucleic acids ?

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61. Q67 2016

    How many pairs of nitrogenous bases are there in one complete turn of B-DNA?

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62. Q68 2015

    How many codons are present in inheritance codon?

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63. Q69 2015

    Operon model was proposed by

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64. Q70 2015

    Differentiate between DNA and RNA.

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