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. Swelling of the can is caused primarily by
A. gas forming, anaerobic spore formers
B. gas forming, aerobic spore formers
C. both A and B
D. none of these
2. Human transmission of Brucellae occurs by
A. ingestion of contaminated meat
B. direct contact with animal tissues
C. ingestion of infected milk
D. all of these
3. Which of the following algal divisions is characterized by possession of chlorophylls A and B, starch as the energy storage material, cellulosic cell walls and live in freshwater and marine habitats?
A. Chlorophyta
B. Chrysophyta
C. Phaeophyta
D. Pyrrophyta
4. What is the average incubation period for development of AIDS?
A. One year
B. Five years
C. Ten years
D. Twenty years
5. Enzyme catalase has non-protein metal as
A. magnesium
B. manganese
C. iron
D. zinc
6. Antigen binding sites of an immunoglobulin are located in
A. light chain alone
B. heavy chain alone
C. Fc region of the antibody
D. Fab regions of the antibody
7. Sarcina sickness of beer is caused by
A. Saccharomyces cerevisiae
B. Pedicoccus cerevisiae
C. S. carlsbergensis
D. Zygomonas anaeroium
8. More spoilage of eggs is caused by
A. bacteria than molds
B. molds than bacteria
C. synergistically
D. none of these
9. The mutation which will not affect the length of a protein is,
A. nonsense mutation
B. missense mutation
C. frameshift mutation
D. all of these
10. Which of the following bacteria is associated with food poisoning due to consumption of sea fish?
A. Vibrio parahaemolyticus
B. V alginolyticus
C. V vulnificus
D. All of these
11. The biogas production process takes place at the temperature
A. lesser than 25°C
B. 25-40°C
C. 45-60°C
D. all of these
12. The current genus name of a saccharolytic group of Bacteroides is
A. Porphyromonas
B. Bacteroides
C. Prevotella
D. None of these
13. Which of the following biotypes of Vibrio cholerae are prevalent in India?
A. EI Tor
B. Classical
C. Both A and B
D. None of these
14. The efficiency of amplification in PCR in later cycles is reduced due to
A. reduction in substrate concentration
B. insufficient enzyme and time to synthesize mass quantity of DNA
C. build up of PCR product which competes with primers for hybrid formation
D. all of these
15. Bulgarian butter milk is made with the help of
A. Lactobacillus bulgaricus
B. Streptococcus lactis
C. Streptococcus thermophilus
D. S. cremoris
16. Induction of tolerance mechanism(s) is/are
A. suppression
B. clonal deletion
C. clonal anergy
D. all of these
17. Mycoplasmas are different from the other prokaryotes by
A. presence of chitin in cell walls
B. presence of murrain in cell walls
C. presence of proteins in cell walls
D. absence of cell wall itself
18. Which of the following toxin causing botulism is less toxic to human beings?
A. Type A
B. Type B
C. Type C
D. None of these
19. The staphylococcal intoxication refers to presence of
A. an enterotoxin
B. neurotoxin
C. mycotoxin
D. All of these
20. Viruses require __________ for growth.
A. bacteria
B. plants
C. animals
D. living cells
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