Test Your Knowledge - Free MCQ PRACTICE
by Saksham Chaudhry : Paschim Vihar, New Delhi 110063 T: 1142316457, 9810570740
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A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.
For each of the following multiple choice questions, choose the most appropriate answer :

1. The predominant micro-organisms in frozen foods are
A. Bacteria 
B. Micro-coccus 
C. Yeast and moulds 
D. None of these 

2. Guanine always binds to
A. Cytosine 
B. Guanine 
C. Thymine 
D. None of these 

3. The original enzyme(s) used in PCR reaction is/are known as
A. E. coli DNA polymerase 
B. E. coli RNA polymerase 
C. Taq polymerase 
D. All of these 

4. Reduction is the
A. Loss of proton 
B. Gain of electron 
C. Loss of electron 
D. Gain of protons 

5. The original enzyme(s) used in PCR reaction is/are known as
A. E. coli DNA polymerase 
B. E. coli RNA polymerase 
C. Taq polymerase 
D. All of these 

6. Polymerase chain reaction basically consists of
A. Two steps 
B. Three steps 
C. Four steps 
D. Five steps 

7. In DNA sequencing, the primer
A. Specifies where the sequence ends 
B. Specifies where the sequence begins 
C. Both A and B 
D. Generates variety of different sized fragments 

8. Human pathogenic bacteria is/are
A. B pseudomallei 
B. Burkholderia mallei 
C. Pseudomonas aeruginosa 
D. All of these 

9. Concentrate of fruits and vegetable juices
A. Favor the growth of 
B. Favour the growth of yeast and of acid and sugar tolerant Leuconostoc and Lactobacillus species 
C. Favor the growth of Saprophytic bacteria 
D. None of the above 

10. Cycloserine inhibits
A. Alanine racemase 
B. D-alanyl - D-alanine synthetase 
C. Both A and B 
D. Amidase 

11. Which of the following may account for the small size of the cells?
A. The surface area/volume ratio 
B. All of the above 
C. The rate of diffusion 
D. The number of mRNAs that can be produced by the nucleus 

12. Sreptococcus pyogenes can be differentiated from other haemolytic Streptococci on the basis of
A. Erythromycin sensitivity 
B. Aminoglycosides sensitivity 
C. Penicillin sensitivity 
D. Bacitracin sensitivity 

13. The Sarcina sickness of beer, caused by Pedicoccus cerevisiae, is characterized by
A. Sourness 
B. Turbidity 
C. Popiness 
D. All of these 

14. Which of the following is capable of oxidizing sulfur to sulfates?
A. Thiobacillus thiooxidans 
B. Desulfotomaculum 
C. Rhodospirillum 
D. Rhodomicrobium 

15. Which of the following reflects the correct order of events that take place during the multiplication of a virus?
A. Attachment, penetration, maturation, biosynthesis, release 
B. Attachment, penetration, biosynthesis, maturation, release 
C. Penetration, attachment, biosynthesis, maturation, release 
D. Attachment, release, biosynthesis, maturation, penetration 

16. The process by which phage reproduction is initiated in lysogenized culture is called
A. Infection 
B. Integration 
C. Repression 
D. Induction 

17. The membranes of which domains are chemically the most similar?
A. Archaea and Bacteria 
B. Eukarya and Archaea 
C. Membranes of all three domains are chemically identical 
D. Bacteria and Eukarya 

18. Which of the following organism is found at the initial stages in the batter of Idli?
A. Leuconostoc mesentroides 
B. Aspergillus niger 
C. Bacillus natio 
D. None of these 

19. In DNA sequencing, the primer
A. Specifies where the sequence ends 
B. Specifies where the sequence begins 
C. Both A and B 
D. Generates variety of different sized fragments 

20. Which of the following nucleic acid is present in hepatitis B virus?
A. DsDNA 
B. SsRNA 
C. SsDNA 
D. DsRNA 

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