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. Marinated (sour pickled) fish should not have spoilage problems unless
A. the acid content is very high
B. the acid content is low enough
C. the acid content is moderate
D. none of the above
2. Which of the following gram-negative bacteria is/are not aerobic?
A. Pseudomonas
B. Neisseria
C. Escherichia
D. None of these
3. Negative strand ssRNA viruses need to have a preformed replicase when they invade a mammalian cell because they
A. use it to terminate transcripts when they copy host cell mRNA
B. have to make a positive strand copy that can be translated
C. use it to modify host enzymes that are recruited for viral replication
D. none of the above
4. What is the usual sequence of a Pribnow box?
A. AUAUA
B. TATAAT
C. UUUUU
D. TTGACA
5. Which of the following lymphokine(s) is secreted by delayed-type-hypersensitivity cells?
A. Macrophage stimulating factor
B. Migration inhibiting factor
C. Macrophage activating factor
D. All of the above
6. 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
7. Animal viruses with capsids displaying helical symmetry include
A. measles and mumps
B. influenza
C. rabies
D. all of these
8. Black mold rot is caused by
A. niger
B. Trichoderma
C. Trichothecium roseum
D. None of these
9. All of the following are features of prokaryotes except
A. nitrogen fixation
B. photosynthesis
C. sexual reproduction
D. locomotion
10. Catalase production is negative in which of the following?
A. Streptococcus
B. Salmonella
C. Proteus
D. Staphylococcus
11. Bulgarian butter milk is made with the help of
A. Lactobacillus bulgaricus
B. Streptococcus lactis
C. Streptococcus thermophilus
D. S. cremoris
12. The gram-negative organisms is
A. Actinomyces
B. Bacillus
C. Clostridium
D. None of these
13. Which of the following disinfectants act by disrupting microbial membranes?
A. Cationic detergents
B. Halogens
C. Heavy metals
D. Aldehydes
14. 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
15. 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
16. The nonsymbiotic bacteria which fix nitrogen live in the soil independently are
A. Azotobacter
B. Clostridium
C. considerably less important in comparison to the symbiotic bacteria
D. all of the above
17. 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
18. Self reactive antibodies are not found in significant concentration in normal serum because
A. it is impossible to generate a self-reactive antibody
B. self reactive B cells are killed by CD8 T cells
C. B cells that are stimulated via their surface bound antibody in the absence of T cell help to commit suicide
D. self reactive B cells switch to IgA which is all secreted and not present in serum
19. The five-kingdom system of classification was set up by
A. Louis Pasteur
B. Robert Whittaker
C. Robert Koch
D. Masaki Ogata
20. Lactobacilli grow best under
A. strict anaerobic conditions
B. microaerophilic conditions in presence of 5% CO2 and PH6
C. microaerophilic conditions in presence of 3% CO2 and PH5
D. microaerophilic conditions in presence of 2% CO2 and PH4
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