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Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 16 (60 MCQs)

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1. Which of the following facts did Hershey and Chase make use of in trying to determine whether DNA or protein is the genetic material?
2. Which of the following has dual functions?
3. Which is also called the sense strand?
4. The enzyme that unwinds the DNA to prepare for replication
5. If a double-stranded DNA molecule contains 30% T, how much G does it contain?
6. Frederick Griffith's transforming principle demonstrated that:
7. The structure in chromatin seen as 'beads-on-string' when viewed under an electron microscope is called:
8. Ligase is an enzyme required for
9. DNA is a polymer made of .....
10. Harshey and Chase provided the final proof that DNA is the genetic material
11. Nucleosome contains
12. The technique developed by Frederick Sanger was crucial for:
13. If a double stranded DNA has 20% of cytosine, Calcualte the percentage of adenine in DNA.
14. In the Meselson/Stahl experiment, which of the following results was observed in the CsCl2 density sedimentation separation of the DNA replication products after ONE generation in $^{14}$NH4Cl
15. Name the person who discovered 'nuclein'
16. In the lac operon, the repressor protein is coded by:
17. A complex of ribosomes attached to a single strand of RNA is known as
18. Telomere shortening puts a limit on the number of times a cell can divide. Research has shown that telomerase can extend the life span of cultured human cells. How might adding telomerase affect cellular aging?
19. It is nonsense to think that DNA has-
20. Chargraff's Rule says that
21. Which one of the following is not found in DNA?
22. Who gave the X ray data for double helical model of DNA
23. In DNA replication, the primer is:-
24. Which of the following is a nonsense codon?
25. DNA has a alternate grooves-
26. It became apparent to Watson and Crick after completion of their model that the DNA molecule could carry a vast amount of hereditary information. Which of the following characteristics of DNA is responsible for this?
27. In a mutation event, when adenine is replaced by guanine, it is a case of
28. Select the incorreclty matched pair.
29. A small circular piece of DNA found in bacteria are called .....
30. Which strand is synthesized continuously during DNA Replication
31. The lac operon genes only become expressed if:
32. Which of the following is not involved in the initiation of replication?
33. In Prokaryotes, gene reguoccurs at the level of
34. Chemically, RNA is (i) reactive and (ii) stable as compared to DNA.
35. Assertion:Enzymes required for DNA replication are efficient enzymes Reason:They can polymerise large number of nucleotides in very short time
36. 5'-3' end of DNA strand is called
37. The significant aspect of reverse transcription is
38. They year 2003 was celebrated as the 50th anniversary of discovery of
39. Lac operon is switched on in the presence of
40. A base sequence is shown:ACAGTGC How would the base sequence be coded on mRNA?
41. Which is the Codon containing
42. DNA finger printing is a technique in molecular biology. Arrange the following steps in sequence. 1) Blotting of DNA fragment to nitro cellulose. 2) Digestion of DNA by restriction endonuclease. 3) Detection of DNA by autoradiography. 4)Isolation of DNA, 5) separation of DNA fragments by electrophoresis
43. Each set of three nitrogen bases that represents an amino acid is .....
44. DNA replication takes place at ..... phase of the cell cycle.
45. Both deoxyribose and ribose belong to a class of sugars called:
46. The DNA strand that codes for protein is known as the .....
47. In transcription in eukaryotes, heterogenous nuclear RNA (hnRNA) is tmascribed by
48. One gene-one enzyme hypothesis was proposed by
49. Which is the first step?
50. Pick the correct pair with respect to primers used in DNA replication.
51. Which RNA carries amino acids?
52. Which is the fourth step?
53. Which enzyme proofreads the DNA after replication to catch any mistakes?
54. In the template with polarity 3'-5' the replication is
55. This enzyme helps helicase unzip DNA by relieving supercoiling
56. Some viruses with RNA as genetic material has been reported
57. The pitch of the DNA helix (one complete turn) is
58. Escherichia coli with completely radioactive DNA was allowed to replicate in nonradioactive medium for two generations. Percentage of bacteria with radioactive DNA is
59. Coding sequence or expressed sequence is
60. In DNA replication, the resulting daughter molecules contain one strand of the original parental DNA and one new strand. What is the explanation for this phenomenon?
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