Class 12th Board Exam Biology Important Chapter Wise MCQ Question in English
6. MOLECULAR BASIS OF INHERITANCE
1. Which one of the following is mobile genetic elements ?
(A) Split gene
(B) Transposon
(C) Jumping gene
(D) Both (B) and (C)
| Answer :- (B) |
2. Lac operon consists of how many structural ganes ?
(A) 1 (a)
(B) 2 (y and z)
(C) 3 (z, y and a)
(D) four
| Answer :- (C) |
3. Which among the following anticodon is meant for “GAC” codon of DNA ?
(A) CTG
(B) CUG
(C) Both A & B
| Answer :- (B) |
4. Name the genetic metrial in TMV (Tabacco Mosaic Virus).
(A) DNA
(B) RNA single stranded
(C) RNA double stranded
(D) R-DNA
| Answer :- (B) |
5. Which type of the nitrogenous bases of Purine occur in DNA and RNA ?
(A) Adenine
(B) Guranine
(C) Both (A) and (B)
(D) Cytosine
| Answer :- (C) |
6. Which one is initiation codon?
(A) UAG and UGA
(B) AUG and GUG
(C) UAA and UAG
(D) UAA and UGA
| Answer :- (B) |
7. What will be the base sequence of DNA against the base sequence ‘AUCGCCUGA’ of RNA?
(A) TTGCGGACT
(B) TAGCGGACT
(C) UAGCGGAÇU
(D) TAGCCCACT
| Answer :- (B) |
8. The function of polymerase chain reaction is :
(A) Transcription
(B) Translation
(C) Both (A) and (B)
(D) DNA amplification
| Answer :- (D) |
9. The phenotypic ratio in a dihybrid cross is :
(A) 3:1
(B) 1:2:1
(C) 9: 7
(D) 9:3:3:1
| Answer :- (D) |
10. Gene for hypertrichosis (having pinna) is present on:
(A) X-chromosome
(B) Y-chromosome
(C) Sex chromosome
(D) Autosome
| Answer :- (B) |
11. A gene pair hides the effect of another gene pair. The phenomenon is :
(A) Epistasis
(B) Dominance
(C) Mutation
(D) None of these
| Answer :- (B) |
12. In a DNA molecule, the cytosine is 18%. The percentage of adenine is:
(A) 64
(B) 36
(C) 82
(D) 32
| Answer :- (D) |
13. Which part of the donor’s eye is used for grafting in order to cure certain cases of blindness ?
(A) Lens
(B) Retina
(C) Cornea
(D) Choroid
| Answer :- (C) |
14. RNA differs from DNA in containing :
(A) phosphate
(B) ribose
(C) deoxyribose
(D) cytosine
| Answer :- (B) |
15. A sequence of three bases on t RNA which binds to mRNA codon is :
(A) triplet
(B) non-sense codon
(C) anticodon
(D) termination codon
| Answer :- (C) |
16. The number of linkage groups in a cell having 2n = 14 is :
(A) 5
(B) 10
(C) 7
(D) 14
| Answer :- (C) |
17. In which stage does crossing over take place ?
(A) Leptotene
(B) Cytokinesis
(C) Pachytene
(D) Diakinesis
| Answer :- (C) |
18. Nucleic acids are polymers of :
(A) Nucleotides
(B) Nucleosides
(C) Amino acids
(D) Nucleoproteins
| Answer :- (A) |
19. Pyrimidines present in DNA are :
(A) Thymine and Cytosine
(B) Adenine and Guanine
(C) Cytosine and Uracil
(D) Thyminie and Uracil
| Answer :- (A) |
20. Crossing over takes place in :
(A) Zygotene
(B) Leptotene
(C) Pachytene
(D) Metaphase
| Answer :- (C) |
21. Which diseases is due to heamoglobin’s defect?
(A) Down’s syndrome
(B) Phenyl ketonuria
(C) Klinefelter syndrome
(D) Sickle cell anaemia
| Answer :- (D) |
22. Pyrimidines present in RNA are :
(A) Cytosine and Thymine
(B) Adenine and Guanine
(C) Cytosine and Uracil
(D) Thymine and Uracil
| Answer :- (C) |
23. PCR method is useful for :
(A) DNA synthesis
(B) Protein synthesis
(C) Amino acid synthesis
(D) DNA amplification
| Answer :- (D) |
24. How many codons are present inheritance codon?
(A) 4
(B) 16
(C) 32
(D) 64
| Answer :- (D) |
25. Operon model was proposed by :
(A) Watson and crick
(B) Nirenberg
(C) Jacob and Monad
(D) none of them
| Answer :- (C) |
26. 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) |
27. Who discovered DNA polymerase :
(A) Okazaki
(B) Watson and Crick
(C) Meselson and Stahl
(D) Kornberg
| Answer :- (D) |
28. Khorana was awarded Nobel Prize for :
(A) Discovering DNA
(B) Discovering RNA
(C) Chemical synthesis of gene
(D) Discovering DNA polymerase
| Answer :- (C) |
29. A gene of operon which forms the repressor protein is:
(A) Operator
(B) Promoter
(C) Regulator
(D) Structural
| Answer :- (C) |
30. Anticodon found in :
(A) on DNA
(B) on tRNA
(C) on rRNA
(D) on mRNA
| Answer :- (B) |
31. The coding sequence of a monocistronic structural gene is called :
(A) Intron
(B) Exon
(C) Cistron
(D) Recon
| Answer :- (B) |
32. DNA fragments are joined in a correct sequence by :
(A) DNA ligase
(B) RNA polymerase
(C) Helicase
(D) DNA polymerase
| Answer :- (C) |
33. Satellite DNA is useful tool in :
(A) Sex determination
(B) Forensic science
(C) Genetic engineering
(D) Organ Transplantation
| Answer :- (C) |
34. The size of the variable number of tandem repeats (VNTR) varies from:
(A) 0.1 to 20 (kb)
(B) 20 to 150 (kb)
(C) 100 to 1000 (kb)
(D) 0.001 to 0.1 (kb)
| Answer :- (B) |
35. Amplification of gene for interest may be done by :
(A) MMR
(B) PCR
(C) MRI
(D) All of these
| Answer :- (B) |
36. RNAi is used to control pests on which plant ?
(A) Tobacco
(B) Mango
(C) Potato
(D) Poppy
| Answer :- (A) |
37. For induction of alien DNA in host cell we may use :
(A) Gene gun
(B) Micro-pipette
(C) Both (A) & (B)
(D) None of these
| Answer :- (A) |
38. Okazaki fragment is :
(A) RNA (RNA primers)
(B) Small segments of DNA on leading stand
(C) Small segments of DNA on lagging stand
(D) None of these
| Answer :- (C) |
39. One of these is not prepared directly from DNA:
(A) m-RNAL
(B) t-RNA
(C) r-RNA
(D) Protein
| Answer :- (D) |
40. DNA double helix model was given by :
(A) Knoll and Ruska
(B) Khorana
(C) Watson and Crick
(D) Priestley
| Answer :- (C) |
41. Synthesis of RNA on DNA template is known as:
(A) Translation
(B) Trancription
(C) Transduction
(D) Replication
| Answer :- (B) |
42. Uracil is related to:
(A) RNA
(B) DNA
(C) Both (A) and (B)
(D) None of these
| Answer :- (A) |
43. RNA is the genetic material in :
(A) prokaryotes
(B) eukaryotes
(C) Tobacco Mosaic Virus (TMV)
(D) E. coli
| Answer :- (C) |
44. Trisomy (2n + 1) causes retardation in child, which is known as :
(A) Philadelphia
(B) Down’s Syndrome
(C) Albinism
(D) None of these
| Answer :- (B) |
45. DNA fingerprinting is :
(A) DNA typing
(B) DNA Profiling
(C) Both ‘A’ and ‘B’
(D) base paring
| Answer :- (C) |
46. DNA is genetic material of :
(A) T.M.V.
(B) Bacteriophage
(C) ‘A’ and ‘B’ both
(D) None of these
| Answer :- (B) |
47. Which of the nitrogenous base is not present in RNA:
(A) Thymine
(B) Cytosine
(C) Guarnine
(D) Adenine
| Answer :- (A) |
48. Operon Model is representation of :
(A) Gene synthesis
(B) Gene expression
(C) Gene regulation
(D) Gene function
| Answer :- (D) |
49. Which nitrogenous base is absent in DNA ?
(A) Thymine
(B) Uracil
(C) Guanine
(D) Cytosine
| Answer :- (B) |
50. Formation of m RNA from DNA is called :
(A) Transcription
(B) Replication
(C) Translation
(D) None
| Answer :- (A) |
51. 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) |
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