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 kind of bacteria causing spoilage in fish at chilling temperature is
A. species of Pseudomonas
B. Micrococcus
C. Bacillus
D. none of these
2. Nitrogen fixation by the microorganisms can be detected by adopting the approach of
A. demonstrating growth in a nitrogen free medium
B. cultivating the microorganisms in the presence of nitrogen labeled with isotropic nitrogen
C. measuring15N2 by mass spectrometer
D. all of the above
3. Viral infections frequently observed in HIV disease is /are
A. herpes simplex
B. varicella- zoster
C. cytomegalo virus
D. all of these
4. Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as
A. ingestion of bacteria
B. ingestion of mold
C. ingestion of fungi
D. all of these
5. The process by which phage reproduction is initiated in lysogenized culture is called
A. infection
B. integration
C. repression
D. induction
6. The number of members of the division Phaeophyta that live in freshwater habitats
A. is greater than the number of members of the division Chloro-phyta that live in freshwater habitats
B. is lesser than the number of members of the division Chlorophyta that live in freshwater habitats
C. is equal to the number of members of the division Chlorophyta that live in freshwater habitats
D. none of the above
7. A major difference between EHEC and EPEC is
A. EHEC secretes a Shiga-like toxin and EPEC does not
B. EHEC possesses a type III secretion system and EPEC does not
C. EPEC rearranges host cell actin and EHEC does not
D. EPEC passes through the placenta to infect the fetus and EHEC does not
8. Hepatitis G virus belongs to the family
A. Caliciviridae
B. Flaviviridae
C. Hepadnaviridae
D. Coronaviridae
9. Which of the following is not true for eukaryotic cells?
A. Nucleus is bounded by nuclear membrane
B. Chromosomes contain histones
C. Chloroplasts and mitochondria contains 70S ribosomes
D. Gas vacuoles are present
10. Cycloserine may be isolated from the cultures of
A. S. orchidaceus
B. S. lavendulae
C. S. garyphalus
D. All of these
11. The number of sets of chromosomes in a dikaryotic cell
A. is greater than diploid cell
B. is lesser than diploid cell
C. is equal to diploid cell
D. none of these
12. An endergonic reaction is one that
A. requires energy in order to proceed
B. releases energy for work
C. gives off much heat
D. looses energy
13. Which of the following genera can cause disease in humans?
A. Orthopoxvirus
B. Parapoxvirus
C. Molluscipoxvirus
D. All of these
14. With reference to antibiotic resistance, all of the following statements are true EXCEPT
A. Most common mechanism is production of neutralizing substances
B. Plasmid mediated antibiotic resistance is always transmitted vertically
C. Complete elimination of the target is the mechanism of resistance to Vancomycin in some the strains of enterococcus
D. Alteration of target is the mechanism of resistance in some of the Pneumococcal strains
15. The agent representing an isolate of hepatitis G virus is
A. GBA-A
B. GBV-B
C. GBV-C
D. none of these
16. A bacterial food intoxication refers to
A. illness caused by presence of pathogens
B. food borne illness caused by the presence of a bacterial toxin formed in food
C. both A and B
D. none of the above
17. __________is probably the most important characteristic for classification of viruses in eukaryotes.
A. Host preference
B. Morphology
C. Physical nature of virion constituents
D. Chemical nature of virion constituents
18. The five-kingdom system of classification was set up by
A. Louis Pasteur
B. Robert Whittaker
C. Robert Koch
D. Masaki Ogata
19. Which of the following is not employed as an oxidation method?
A. Oxidation ponds
B. Trickling filters
C. Contact aerators
D. All of these
20. The organism which grows best above 45°C are called
A. psychrophilic
B. mesosphilic
C. thermophilic
D. any of these
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