Most Recently Asked Structure Of DNA & RNA Objective Type Questions And Answers

51. The bases Adenine and Thymine are paired with
a. Double hydrogen bonds
b. Single hydrogen bonds
c. Triple hydrogen bonds
d. Both b and c
Ans: A

52. The no. of hydrogen bonds existing between Guanine and Cytosine are
a. 5
b. 2
c. 3
d. None of these
Ans: C

53. The length of each coil in DNA strand is
a. 15 Ao
b. 34 Ao
c. 30 Ao
d. 5 Ao
Ans: B

54. Nucleic acids are highly charged polymers due to
a. There is phosphodiester bond between 5’- hydroxyl of one ribose and 3’–hydroxyl of next ribose
b. They have positive and negative ends
c. Nucleotides are charged structures
d. Nitrogenous bases are highly ionized compounds
Ans: A

55. The best studied example for specialized transduction is
a. P1 phage
b. P22 phage
c. ë-phage
d. Both a and c
Ans: C

56. The diagrammatic representation of the total no. of genes in DNA is
a. Genome
b. Gene map
c. Gene-structure
d. Chromatin
Ans: B

57. During specialized transduction
a. Large amound of DNA is transferred
b. A few no. of genes are transferred
c. Whole DNA is transferred
d. None of these
Ans: B

58. The cell donating DNA during transformation is
a. Endogenate
b. Exogenate
c. Mesozygote
d. Merosite
Ans: B

59. Genetic information transfer DNA to RNA is called –
a. Transcriptase
b. Transduction
c. Transformation
d. Recombination
Ans: A

60. The gene transfer occurs by –
a. Transformation
b. Transduction
c. Conjugation
d. Cell fusion
Ans: A

More Questions & Answers:-
Page1 Page2 Page3 Page4 Page5 Page6

Best Structure Of DNA & RNA Objective Type Questions And Answers

41. Western blotting is the technique used in the determination of
a. RNA
b. DNA
c. Proteins
d. All of these
Ans: B

42. m RNA synthesis from DNA is termed
a. Transcription
b. Transformation
c. Translation
d. Replication
Ans: A

43. Western blotting is a technique used in the determination of
a. DNA
b. RNA
c. Protein
d. Polysaccharides
Ans: A

44. Building blocks of Nucleic acids are
a. Amino acids
b. Nucleosides
c. Nucleotides
d. Nucleo proteins
Ans: C

45. DNA finger printing is based on
a. Repetitive sequences
b. Unique sequences
c. Amplified sequences
d. Non-coding sequences
Ans: B

46. The enzyme required for DNA from RNA template:
a. RNA polymerase
b. Reverse transcriptase
c. DNA polymerase
d. Terminal transferase
Ans: B

47. Double standard RNA is seen in
a. Reo virus
b. Rhabdo virus
c. Parvo virus
d. Retro virus
Ans: A

48. Example for DNA viruses:
a. Adeno virus
b. Bacteriophage T1, T2, T3, T4, T5, T6
c. Papova virus
d. Herpes virus and cauliflower moisaic
e. All of the above
Ans: E

49. The following are the RNA viruses, except
a. Reo viruses
b. Retro viruses
c. Bacteriophage F C
d. Tmv and Bacteriophages Ms2, F2
e. Dahila mosaic virus and Bacteriophages F × 174, M12, M13
Ans: E

50. The two strands of DNA are joined noncovalently by
a. Ionic bonds
b. Covalent bonds
c. Hydrogen bonds between bases
d. Polar charges
Ans: C

More Questions & Answers:-
Page1 Page2 Page3 Page4 Page5 Page6

Common Structure Of DNA & RNA Objective Type Questions And Answers

31. Peptide linkages are formed in between
a. Nucleotides
b. Amino acids
c. Glucose molecules
d. Sucrose
Ans: B

32. The nucleic acid of polio viruses is
a. DNA
b. RNA – (+) type
c. t-RNA
d. m-RNA
Ans: B

33. Rabies virus is
a. Nake RNA virus
b. Naked DNA virus
c. Enveloped RNA virus
d. Enveloped DNA virus
Ans: C

34. Example for DNA virus:
a. Polio virus
b. Adeno virus
c. Echo virus
d. Poty virus
Ans: B

35. In genetic engineering breaks in DNA are formed by enzymes known as
a. Restriction enzymes
b. Ligases
c. Nucleases
d. Hydralases
Ans: B

36. DNA transfer from one bacterium to another through phages is termed as
a. Transduction
b. Induction
c. Transfection
d. Infection
Ans: A

37. Microorganisms usually make acetyl CO-A by oxidizing
a. Acetic acid
b. Pyruvic acid
c. a-ketoglutaric acid
d. Fumaric acid
Ans: A

38. The method of DNA replication proposed by Watson and Crick is
a. Semi conservative
b. Conservative
c. Dispersive
d. Rolling loop
Ans: A

39. The distance between each turn in the helical strand of DNA is
a. 20 Ao
b. 34 Ao
c. 28 Ao
d. 42 Ao
Ans: B

40. Self-replicating, small circular DNA molecules present in bacterial cell are known
a. Plasmids
b. Cosmids
c. Plasmomeros
d. plastides
Ans: A

More Questions & Answers:-
Page1 Page2 Page3 Page4 Page5 Page6

Structure Of DNA & RNA Multiple Choice Questions And Answers

21. A gene that takes part in the synthesis of polypeptide is
a. Structural gene
b. Regulator gene
c. Operator gene
d. Promoter gene
Ans: A

22. DNA replicates during
a. G1 – phase
b. S – phase
c. G2 – phase
d. M – phase
Ans: B

23. A human cell containing 22 autosome and a ‘Y’ chromosome is probably a
a. Male somatic cell
b. Zygote
c. Female somatic cell
d. Sperm cell
Ans: B

24. Crossing-over most commonly occurs during
a. Prophase I
b. Prophase II
c. Anaphase I
d. Telophase II
Ans: A

25. DNA-replication is by the mechanism of
a. Conservative
b. Semiconservative
c. Dispersive
d. None of the above
Ans: B

26. Production of RNA from DNA is called
a. Translation
b. RNA splicing
c. Transcription
d. Transposition
Ans: C

27. Nucleic acids contain
a. Alanine
b. Adenine
c. Lysine
d. Arginine
Ans: B

28. What are the structural units of nucleic acids?
a. N-bases
b. Nucleosides
c. Nucleotides
d. Histones
Ans: C

29. The most important function of a gene is to synthesize
a. Enzymes
b. Hormones
c. RNA
d. DNA
Ans: A

30. One of the genes present exclusively on the X-chromosome in humans is concerned with
a. Baldness
b. Red-green colour baldness
c. Facial hair/moustache in males
d. Night blindness
Ans: B

More Questions & Answers:-
Page1 Page2 Page3 Page4 Page5 Page6

Structure Of DNA & RNA Objective Type Questions And Answers

11. The technique involved in comparing the DNA components of two samples is known as
a. Monoclonal antibody techniques
b. Genetic finger printing
c. Recombinant DNA technology
d. Polymerase chain reaction
Ans: B

12. Plasmids are ideal vectors for genecloning as
a. They can be multiplied by culturing
b. They can be multiplied in the laboratory using enzymes
c. They can replicate freely outside the bacterial cell
d. They are self replicating within the bacterial cell
Ans: D

13. Humans normally have 46 chromosomes in skin cells. How many autosomes would be expected in a kidney cell?
a. 46
b. 23
c. 47
d. 44
Ans: D

14. Pasteur effect is due to
a. Change from aerobic to anaerobic
b. Providing oxygen to anaerobically respiring structures
c. Rapid utilization of ATP
d. Nonsynthesis of ATP
Ans: B

15. A mechanism that can cause a gene to move from one linkage group to another is
a. Trans location
b. Inversion
c. Crossing over
d. Duplication
Ans: A

16. The smallest unit of genetic material that can undergo mutation is called
a. Gene
b. Cistron
c. Replicon
d. Muton
Ans: D

17. The two chromatids of metaphase chrosome represent
a. Replicated chromosomes to be separated at anaphase
b. Homologous chromosomes of a diploid set
c. Non-homologous chromosomes joined at the centromere
d. Maternal and paternal chromosomes joined at the centromere
Ans: A

18. Malate dehydrogenase enzyme is a
a. Transferase
b. Hydrolase
c. Isomerase
d. Oxido reductase
Ans: D

19. In E.Coli att site is in between
a. Gal and biogenes
b. Bio and niacin genes
c. Gal and B genes
d. None of these
Ans: A

20. The best vector for gene cloning
a. Relaxed control plasmid
b. Stringent control plasmid
c. Both a and b
d. None of these
Ans: A

More Questions & Answers:-
Page1 Page2 Page3 Page4 Page5 Page6

60 Top Structure Of DNA & RNA Objective Type Questions And Answers

1. A peculiar cytochrome is observed in bacteria and it can react with molecular oxygen, what is it?
a. Cyt b
b. Cyt c
c. Cyt d
d. Cyt o
Ans: D

2. The genetic material in HIV is
a. ds DNA
b. ss DNA
c. s RNA
d. None of these
Ans: A

3. Which one of the following mutagens act only on replicating DNA?
a. Ethidium bromide
b. Nitrosogeranidine
c. Acridine orange
d. None of above
Ans: C

4. Poly A tail is frequently found in
a. Histone in RNA
b. Bacterial RNA
c. eukaryotic RNA
d. TRNA
Ans: C

5. Which of the following is an example of RNA virus?
a. SV 40
b. T4 phage
c. Tobacco mosaic virus
d. Adeno virus
Ans: C

6. Genomic DNA is extracted, broken into fragments of reasonable size by a restriction endonuclease and then inserted into a cloning vector to generate chimeric vectors. The cloned fragments are called
a. Clones
b. Genomic library
c. mRNA
d. None of these
Ans: B

7. Transgenic animals are produced when GH gene fused with
a. MT gene
b. GH
c. GRF
d. FIX
Ans: A

8. In which medium the hydridoma cells grow selectively?
a. Polyethylene glycol
b. Hypoxanthine aminopterin thyminine
c. Hypoxathing-guaning phosphoribosyl transferase
d. Both b and c
Ans: B

9. The enzymes which are commonly used in genetic engineering are
a. Exonuclease and ligase
b. Restriction endonuclease and polymerase
c. Ligase and polymerase
d. Restriction endonuclease and ligase
Ans: A

10. A successful hybridoma was produced by fusing
a. Plasma cells and plasmids
b. Plasma cells and myeloma cells
c. Myeloma cells and plasmids
d. Plasma cells and bacterial cells
Ans: B

More Questions & Answers:-
Page1 Page2 Page3 Page4 Page5 Page6