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MCQ on Molecular Biology

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Biology MCQ – MCQ on Molecular Biology

1. Peptide linkages are formed in between

  • Nucleotides
  • Amino acids
  • Glucose molecules
  • Sucrose

2. The nucleic acid of polio viruses is

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  • DNA
  • RNA – (+) type
  • t-RNA
  • m-RNA

3. Rabies virus is

  • Nake RNA virus
  • Naked DNA virus
  • Enveloped RNA virus
  • Enveloped DNA virus

4. Example for DNA virus

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  • Polio virus
  • Adeno virus
  • Echo virus
  • Poty virus

5. In genetic engineering breaks in DNA are formed by enzymes known as

  • Restriction enzymes
  • Ligases
  • Nucleases
  • Hydralases

6. DNA transfer from one bacterium to another through phages is termed as

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  • Transduction
  • Induction
  • Transfection
  • Infection

7. Microorganisms usually make acetyl CO-A by oxidizing

  • Acetic acid
  • Pyruvic acid
  • α-ketoglutaric acid
  • Fumaric acid

8. The method of DNA replication proposed by Watson and Crick is

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  • Semi conservative
  • Conservative
  • Dispersive
  • Rolling loop

9. The distance between each turn in the helical strand of DNA is

  • 20 Ao
  • 34 Ao
  • 28 Ao
  • 42 A0

10. Self-replicating, small circular DNA molecules present in bacterial cell are known

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  • Plasmids
  • Cosmids
  • Plasmomeros
  • plastides

11. Western blotting is the technique used in the determination of

12. m RNA synthesis from DNA is termed

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13. Western blotting is a technique used in the determination of

14. Building blocks of Nucleic acids are

  • Amino acids
  • Nucleosides
  • Nucleotides
  • Nucleo proteins

15. DNA finger printing is based on

  • Repetitive sequences
  • Unique sequences
  • Amplified sequences
  • Non-coding sequences

16. The enzyme required for DNA from RNA template:

17. Double standard RNA is seen in

  • Reo virus
  • Rhabdo virus
  • Parvo virus
  • Retro virus

18. Example for DNA viruses:

  • Adeno virus
  • Bacteriophage T1, T2, T3, T4, T5, T6
  • Papova virus
  • Herpes virus and cauliflower moisaic
  • All of the above

19. The following are the RNA viruses, except

  • Reo viruses
  • Retro viruses
  • Bacteriophage Φ C
  • Tmv and Bacteriophages Ms2, F2
  • Dahila mosaic virus and Bacteriophages Φ× 174, M12, M13

20. The two strands of DNA are joined noncovalently by

  • Ionic bonds
  • Covalent bonds
  • Hydrogen bonds between bases
  • Polar charges

21. The bases Adenine and Thymine are paired with

  • Double hydrogen bonds
  • Single hydrogen bonds
  • Triple hydrogen bonds
  • Both b and c

22. The no. of hydrogen bonds existing between Guanine and Cytosine are

  • 5
  • 2
  • 3
  • None of these

23. The length of each coil in DNA strand is

  • 15 Ao
  • 34 Ao
  • 30 Ao
  • 5 Ao

24. Nucleic ac ids are highly charged polymers due to

  • There is phosphodiester bond between 5’-hydroxyl of one ribose and 3’–hydroxyl of next ribose
  • They have positive and negative ends
  • Nucleotides are charged structures
  • Nitrogenous bases are highly ionized compounds

25. The best studied example for specialized transduction is

  • P1 phage
  • P22 phage
  • ë-phage
  • Both a and c

26. The diagrammatic representation of the total no. of genes in DNA is

  • Genome
  • Gene map
  • Gene-structure
  • Chromatin

27. During specialized transduction

  • Large amound of DNA is transferred
  • A few no. of genes are transferred
  • Whole DNA is transferred
  • None of these

28. The cell donating DNA during transformation is

  • Endogenate
  • Exogenate
  • Mesozygote
  • Merosite

29. Genetic information transfer DNA to RNA is called –

  • Transcriptase
  • Transduction
  • Transformation
  • Recombination

30. The gene transfer occurs by –

  • Transformation
  • Transduction
  • Conjugation
  • Cell fusion

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