You are currently viewing Class 12 Biology Objective In English Chapter – 6 Molecular Basis Of Inheritance
Class 12 Biology Objective In English Chapter - 6 Molecular Basis Of Inheritance

Class 12 Biology Objective In English Chapter – 6 Molecular Basis Of Inheritance

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Class 12 Biology Objective In English Chapter – 6 Molecular Basis Of Inheritance

1. Uracil is related to 

( A ) RNA 

( B ) DNA 

( C ) Both ( A ) & ( D ) 

( D ) None of these 

Answer-( A )

 

2. Lac operon represents  

( A ) Inducible gene system 

( B ) Repressible gene system 

( C ) Housekeeping gene system 

( D ) All of these 

Answer- ( A )

 

3. Synthesis of RNA on DNA template is known as  

( A ) Translation 

( B ) Transcription 

( C ) Transduction 

( D ) Replication 

Answer-( B )

 

4. Which of the following is a wrong pair ? 

( A ) G  C 

( B ) T = A 

( C ) A = U 

( D ) T = U 

Answer- ( D )

 

5. Genes present on same locus having different expression are called : 

( A ) Multiple allele 

( B ) Polygene 

( C ) Oncogene 

( D ) Codominant gene 

Answer- ( A )

 

6. The human chromosome with highest and least number of genes are  

( A ) Chromosome 21 and Y 

( B ) Chromosome 1 and X 

( C ) Chromosome 1 and Y 

( D ) Chromosome X & Y 

Answer- ( C )

 

7. Which of the following phenomena was experimentally proved by Meselson & Stahl ? 

( A ) Transformation 

( B ) Transduction 

( C ) Semi – conservative DNA replication 

( D ) central dogma

Answer- ( C )

 

8. DNA replication takes place at which phase of cell cycle ? 

( A ) G1 

( B ) S 

( C ) G2 

( D ) M 

Answer- ( B )

 

9. If a double stranded DNA has 20 % of cytosine , what will be the percentage of adenine in it ? 

( A ) 20 % 

( B ) 40 % 

( C ) 30 % 

( D ) 60 % 

Answer- ( C )

 

10. During transcription , the site of DNA molecule at which RNA polymerase binds is called : 

( A ) Promoter 

( B ) regulator 

( C ) receptor 

( D ) enhancer 

Answer- ( A )

 

11. Both deoxyribose and ribose belong to a class of sugars called : 

( A ) trioses 

( B ) hexoses 

( C Pentoses 

( D ) Polysacharies 

Answer- ( C )

 

12. Amino acid acceptor end of tRNA lies at

( A ) 5 ‘ end 

( B ) 3’end 

( C ) T C loop 

( D ) DHU loop 

Answer- ( B )

 

13. During expression of an operon , RNA polymerase binds to : 

( A ) Structural gerte 

( B ) regulator gene 

( C ) Operator 

( D ) Promoter 

Answer- ( D )

 

14. If the sequence of bases in coding strand of DNA is ATTCGATG , then the sequence of bases in mRNA will be : 

( A ) TAAGCTAC 

( B ) UAAGCUAC 

( C ) ATTCGATG 

( D ) AUUCGAUG 

Answer- ( D )

 

15. RNA is the genetic material in 

( A ) Prokaryotes 

( B ) Eukaryotes 

( C ) TMV 

( D ) E Coil 

Answer- ( C )

 

16. Khorana was a awarded Nobel Prize for : 

( A ) Discovering DNA 

( B ) Discovering RNA 

( C ) Chemical synthesis of gene 

( D ) Discovering DNA polymerase . 

Answer- ( C )

 

17. Nucleosome contains : 

( A ) Histone molecules 

( B ) Nucleotides 

( C ) Nucleoplasmin 

( D ) Nuclear pore complex 

Answer- ( A )

 

18. Continuously functional genes are : 

( A ) Gene battery 

( B ) Luxury genes 

( C ) Mild genes 

( D ) House keeping genes 

Answer- ( D )

 

19. The ultimate source of variations is : 

( A ) natural selection 

( B ) sexual reproduction 

( C ) mutations 

( D ) hormonal actions 

Answer- ( C )

 

20. Purine base of DNA molecule has 

( A ) A and C 

( B ) C and T 

( C ) A and G 

( D ) None of these 

Answer-( C )


21. Which Nitrogenous base is not present in RNA ? 

( A ) Thymine 

( B ) Uracil

( C ) Adenine 

( D ) Guanine

Answer-( A )

 

22 , which base is present in RNA but absent in DNA ? 

( A ) uracil 

( B ) Guanine 

( c ) Cytosine 

( D ) Thymine 

Answer-( A )

 

23. Nallisomie organism will have a genetic complement of : 

( A ) 2n – 1 

( B ) 2n – 2 

( c ) 2n + 1 

( D ) 2n + 2 

Answer-( B )

 

24. Nucleic acid are strong acids . The acidity is due to : 

( A ) phosphates 

( B ) sugar 

( C ) nitrogen bases 

( D ) H – bonds 

Answer-( A )

 

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

( A ) RNA polymerase I 

( B) RNA polymerase II 

( C ) RNA polymerase III

( D ) All of these 

Answer-( C )

 

26. The specific sequence of DNA recognized by Restriction Endonuclease are 

( A ) Palindromic nucleotide sequence 

( B ) VNTR 

( C ) Minisatellite 

( D ) All of these 

Answer-( A )

 

27 Silencing of gene could be achieved through the use of 

( A ) Short interfering RNA ( RNAi )

( B ) Antisense RNA 

( C ) A & B both 

( D ) None of these 

Answer-( C )

 

28. GAATTC is recognition site for which restriction endonuclease ? 

( A ) Hind III

( B ) Eco R I

( c ) Bam 1 

( D ) Hae III 

Answer-( B )

 

Class 12 Biology Objective In English Chapter – 6 Molecular Basis Of Inheritance

29. Synthesis of DNA from RNA is explained by 

( A ) Central dogma reverse 

( B ) reverse transcription 

( C ) Teminism 

( D ) All of these 

Answer-( D )

 

30. In an animal cell , the process of transcription and translation occur in 

( A ) nucleus only 

( B ) cytoplasm only 

( C ) nucleus & cytoplasm respectively 

( D ) endoplasmic reticulum 

Answer-( C )

 

31. Human genome consists of approximately 

( A ) 3 × 10⁹ bp 

( B ) 6 x 10⁹ bp 

( C ) 20000 – 30000bp 

( D ) 2.2 X 10⁴ bp 

Answer-( C )

 

32. In some viruses , DNA is synthesizer by using RNA as template . Such DNA is called 

( A ) A – DNA 

( B ) B – DNA 

( C )  cDNA 

( D ) rDNA 

Answer-( C )

 

33. Regulation of gene expression occurs at the level 

( A ) transcripte 1 

( B ) processing / splicing 

( C ) translation 

( D ) all of these 

Answer-( D )

 

34. Estimated number of genes in human beings is : 

( A ) 3000 

( B ) 80,000 

( C ) 30,000 

( D ) 3 x 10⁹ 

Answer-( C )

 

35. In a DNA strand the nucleotides are linked together by : 

( A ) glycosidic bonds 

( B ) phosphodiester bond 

( C ) peptide bond 

( D ) hydrogen bond 

Answer-( B )

 

36. In one polynucleotide strand of DNA molecule the ratio of A + T / G + C is 0.3 . What is the A + G / T + C ratio of the entire DNA molecule ? 

( A ) 0.3 

( B ) 0.6 

( C ) 1.2 

( D ) 1 

Answer- ( D )

 

37. Nitrogenous base absent in DNA is : 

( A ) A 

( B ) C 

( C ) T 

( D ) U 

Answer- ( D )

 

38. Ratio of DNA : RNA in prokaryotes is 1 : 2. What is this ratio in eukaryotes ? 

( A ) 1 : 1 

( B ) 2 : 1 

( C ) 1 : 2 

( D ) not fixed 

Answer-( A )

 

39. Which of the following is the odd one out in RNA ? 

( A ) Adenine 

( B ) Guanine 

( C ) Thymine 

( D ) Cytosine 

Answer-( C )

 

40 In DNA molecule , cytosine is always attached to : 

( A ) thymine 

( B ) uracil 

( C ) guanine 

( D ) cytosine 

Answer-( C )

 

41. DNA can be tested by : 

( A ) Iodine test 

( B ) Fuelgen reaction 

( C ) Molish test 

( D ) Millions reagent 

Answer-( B )

 

42. In DNA , the nitrogenous bases are : 

( A ) ATUC 

( B ) AUGC 

( C ) UTGC 

( D ) ATGC 

Answer-( D )

 

43. Pyrimidines in DNA are : 

( A ) thymine and cytosine 

( B ) cytosine and guanine 

( C ) adenine and uracil 

( D ) adenine and thymine 

Answer-( A )

 

44. Anticodon is associated with : 

( A ) TRNA 

( B ) mRNA 

( C ) rRNA 

( D ) genetic RNA 

Answer-( A )

 

45. In double helix of DNA , the two DNA strands are : 

( A ) coiled upon itself around a common axis 

( B ) coiled around each other 

( C ) coiled differently 

( D ) coiled over protein sheath 

Answer-( A )

 

46. Most abundant RNA of the cell is : 

( A ) TRNA 

( B ) rRNA 

( C ) mRNA 

( D ) tRNA threonini

Answer-( B )

 

47. DNA strand are antiparallel because of :

( A ) H-bonds

( B ) phospho-diester bonds

( C ) disulphide (S-S bonds)

( D ) none of the above

Answer-( B )

 

48. In double helix model of DNA how far is each base pair from the next ?

( A ) 34nm 

( B ) 3.4 nm

( C ) 2 nm

( D ) 0.34 nm

Answer-( D )

 

Class 12 Biology Objective In English Chapter – 6 Molecular Basis Of Inheritance

49. How many nucleotides are found in one spiral of B DNA ?

( A ) 5 

( B ) 10 

( C ) 20 

( D ) 25

Answer-( C )

 

50. If DNA has 10 spirals, the length of DNA will be :

( A ) 34 Å 

( B ) 340 Å

( C ) 640 Å 

( D ) 64 Å

Answer-( B )

 

51. The basic unit (monomer) of a nucleic acid molecule is :

( A ) nucleoside 

( B ) nucleotide

( C ) nitrogenous base

( D ) pentose sugar

Answer-( B )

 

52. RNA differs from DNA in nature of :

( A ) sugar and purines

( B ) sugar and pyrimidines

( C ) purines and phosphate

( D.) sugar and phosphate

Answer-( B )

 

53. Nitrogen base is attached to pentose sugar in a nucleoside at carbon atom :

( A )1 

( B ) 2 

( C ) 3 

( D ) 5

Answer-( A )

 

54. Which one is a nucleotide ?

( A ) Uridylic acid

( B ) Thymidine

( C ) Cytosine 

( D ) Glutamic acid

Answer-( A )

 

55. Which RNA is short lived :

( A ) mRNA 

( B ) TRNA

( C.) rRNA 

( D ) SnRNA

Answer-( A )

 

56. Hydrogen bonds present between cytosine and guanosine are :

( A ) 2 

( B ) 3 

( C ) 1 

( D ) 4

Answer-( B )

 

57. The terminal (stop) condon is :

( A )UAG (Amber)

( B )UAA (Ochre)

( C )UGA (Opal)

( D ) All of these

Answer-( D )

 

58. There are 100 amino acids. How many types of proteins can be formed by triplet genetic code ?

( A ) 20¹⁰⁰ 

( B ) (100)²⁰

( C )100 x 20 x 3

( D )100 x 3

Answer-( A )

 

59. Of 64 codons in a genetic code,how many codons are responsible for specifying 20 types of amino acids :

( A ) 61 

( B ) 64 

( C ) 20 

( D ) 59

Answer-( A )

 

60. The initiation codon in protein synthesis is :

( A ) AUG 

( B ) GUG

( C )met  

( D ) AUG and GUG

Answer-( B )

 

61. The genetic code occurs in :

( A ) rRNA  

( B ) TRNA

( C ) rDNA 

( D ) mRNA

Answer-( D )

 

62. Two genes present near by on a chromosome will have :

( A ) Double crossing over

( B ) No crossing over

( C ) Hardly any crossing over

( D ) Regular crossing over

Answer-( C )

 

63. Exchange of segments between non- homologous chromosomes is called:

( A ) Crossing over

( B ) Inversion

( C ) Duplication 

( D ) Translocation

Answer-( D )

 

64. Complete linkage has been reported

in :

( A ) Maize 

( B ) Human female

( C ) Female Drosophilla

( D ) Male Drosophilla

Answer-( D )

 

65. Genes are made up of :

( A ) Lipoprotein

( B ) Nucleosides

( C ) Polynucleotides

( D ) Histones

Answer-( C )

 

66. Triplet UUU codes for :

( A ) Leucine 

( B ) Methionine

( C )Phenylalanine 

( D ) Glycine

Answer-( C )

 

67. In gene mutation, adenine is replaced by guanine. It is :

( A ) Frame-shift mutation

( B )Transcription

( C ) Transition 

( D ) Transversion

Answer-( C )

 

68. A segment of DNA that reads the same forward and backward is called:

( A ) palindromic DNA

( B ) Plasmimic DNA

( C ) complementary DNA

( D ) copy DNA

Answer-( A )

 

69. Purines of RNA are :

( A ) guanine and adenline

( B )uracil and thymine

( C ) adenine and cytosine

( D )uracil and guanine

Answer-( A )

 

70. Which one is correct for RNA ?

( A ) [A] = [U] 

(B) [G] = [C]

( C ) [A] not equal [U]

( D ) [A] + [G]

Answer-( C )

 

71. Which is recognition site of tRNA ?

( A ) Anticodon 

( B ) Loop I

( C ) Loop IV 

( D ) 3-OH end

Answer-( A )

 

72. RNA is synthesized on :

( A ) both strands of DNA

( B ) on sense strand of DNA

( C ) on complementary strand of DNA

( D ) on c DNA

Answer-( B )

 

73. If codon in DNA is AAA. What will be the anticodon for it :

( A )U U U

( B ) AAA

( C ) TTT 

( D ) AUG

Answer-( B )

 

74. DNA fragments are joined by :

( A ) Ligase

( B ) Polymerase

( C ) Helicase 

( D ) Gyrase

Answer-( A )

 

75. DNA and RNA differ by :

( A ) Nitrogen bases and sugars

( B ) Nitrogen bases and phosphate groups

( C ) Number of C-atoms in sugars

( D )Sugar and phosphate groups

Answer-( A )

 

76. Who discovered DNA polymerase

( A ) Okazaki

( B ) Kornberg

( C ) Meselson and Stahl

( D )Watson and Crick

Answer-( B )


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