Structure of DNA & RNA FYBSc Microbiology MCQs Set-2

MCQues DNA RNA Questions Answers

1:Peptide linkages are formed in between 

(a) Nucleotides 
(b) Amino acids 
(c) Glucose molecules 
(d) Sucrose 

Answer:(b) Amino acids 

2:The nucleic acid of polio viruses is 

(a) DNA 
(b) RNA – (+) type 
(c) t-RNA 
(d) m-RNA

Answer:(b) RNA – (+) type 

3:Rabies virus is 

(a) Nake RNA virus 
(b) Naked DNA virus 
(c) Enveloped RNA virus 
(d) Enveloped DNA virus

Answer:(c) Enveloped RNA virus 

4:Example for DNA virus: 

(a) Polio virus 
(b) Adenovirus 
(c) Echo virus 
(d) Potyvirus

Answer:(b) Adenovirus 

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

(a) Restriction enzymes 
(b) Ligases 
(c) Nucleases 
(d) Hydrolases

Answer:(b) Ligases 

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

(a) Transduction 
(b) Induction 
(c) Transfection 
(d) Infection

Answer:(a) Transduction 

7:Microorganisms usually make acetyl CO-A by oxidizing 

(a) Acetic acid 
(b) Pyruvic acid 
(c) α-ketoglutaric acid 
(d) Fumaric acid

Answer:(a) Acetic acid 

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

(a) Semi conservative 
(b) Conservative 
(c) Dispersive 
(d) Rolling loop

Answer:(a) Semi conservative 

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

(a) 20 Ao 
(b) 34 Ao 
(c) 28 Ao 
(d) 42 Ao

Answer:(b) 34 Ao 

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

(a) Plasmids 
(b) Cosmids 
(c) Plasmomeros 
(d) Plastids

Answer:(a) Plasmids 

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

(a) RNA 
(b) DNA 
(c) Proteins 
(d) All of these

Answer:(b) DNA 

12:m RNA synthesis from DNA is termed 

(a) Transcription 
(b) Transformation 
(c) Translation 
(d) Replication

Answer:(a) Transcription 

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

(a) DNA 
(b) RNA 
(c) Protein 
(d) Polysaccharides

Answer:(a) DNA 

14:Building blocks of Nucleic acids are 

(a) Amino acids 
(b) Nucleosides 
(c) Nucleotides 
(d) Nucleo proteins

Answer:(c) Nucleotides 

15:DNA fingerprinting is based on 

(a) Repetitive sequences 
(b) Unique sequences 
(c) Amplified sequences 
(d) Non-coding sequences

Answer:(b) Unique sequences 

16:The enzyme required for DNA from RNA template: 

(a) RNA polymerase 
(b) Reverse transcriptase 
(c) DNA polymerase 
(d) Terminal transferase

Answer:(b) Reverse transcriptase 

17:Double standard RNA is seen in 

(a) Reo virus 
(b) Rhabdo virus 
(c) Parvo virus 
(d) Retro virus

Answer:(a) Reo virus 

18:Example for DNA viruses: 

(a) Adeno virus 
(b) Bacteriophage T1, T2, T3, T4 , T5, T6 
(c) Papova virus 
(d) Herpes virus and cauliflower mosaic 
(e) All of the above

Answer:(e) All of the above

19:The following are the RNA viruses, except 

(a) Reo viruses 
(b) Retro viruses 
(c) Bacteriophage Φ C 
(d) Tmv and Bacteriophages Ms2, F2 
(e) Dahlia mosaic virus and Bacteriophages Φ × 174, M12, M13

Answer:(e) Dahlia mosaic virus and Bacteriophages Φ × 174, M12, M13

20:The two strands of DNA are joined noncovalently by 

(a) Ionic bonds 
(b) Covalent bonds 
(c) Hydrogen bonds between bases 
(d) Polar charges

Answer:(c) Hydrogen bonds between bases 

21: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

Answer:(a) Double hydrogen bonds 

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

(a) 5 
(b) 2 
(c) 3 
(d) None of the

Answer:(c) 3 

23:The length of each coil in DNA strand is 

(a) 15 Ao 
(b) 34 Ao 
(c) 30 Ao 
(d) 5 Ao

Answer:(b) 34 Ao 

24: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

Answer:(a) There is phosphodiester bond between 5’- hydroxyl of one ribose and 3’–hydroxyl of next ribose

25:The best studied example for specialized transduction is 

(a) P1 phage 
(b) P22 phage 
(c) ë-phage 
(d) Both a and c

Answer:(c) ë-phage 

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

(a) Genome 
(b) Gene map 
(c) Gene-structure 
(d) Chromatin

Answer:(b) Gene map 

27:During specialized transduction 

(a) Large amount of DNA is transferred 
(b) A few no. of genes are transferred 
(c) Whole DNA is transferred 
(d) None of these 

Answer:(b) A few no. of genes are transferred 

28:The cell donating DNA during transformation is 

(a) Endogenate 
(b) Exogenate 
(c) Mesozygote 
(d) Merosite

Answer:(b) Exogenate 

29:Genetic information transfer DNA to RNA is called – 

(a) Transcriptase 
(b) Transduction 
(c) Transformation 
(d) Recombination

Answer:(a) Transcriptase 

30:The gene transfer occurs by – 

(a) Transformation 
(b) Transduction 
(c) Conjugation 
(d) Cell fusion

Answer:(a) Transformation