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. Genetic variations are
A. temporary
B. influenced by the environment
C. stable
D. not heritable
2. Lens antigens of the eye are
A. cross-reacting antigens
B. sequestrated antigens
C. neoantigens
D. none of these
3. Cycloserine inhibits
A. alanine racemase
B. D-alanyl - D-alanine synthetase
C. Both A and B
D. amidase
4. Which of the following is considered the most unifying concept in biology?
A. Taxonomy
B. Anatomy
C. Genetics
D. Evolution
5. 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
6. 15 Year old complains of loose motion, intermittent abdominal pain of 1year wet mount of stool shows multiple ova> 100 microns in length. Which of the following agent is responsible
A. Fosciola Gigantica
B. Gastrodiscoides Hominis
C. Ancyclostoma Caninum
D. Ophistotichus viverni
7. A special beer yeast of the bottom type is
A. S. cerevisiae
B. S. carlsbergensis
C. S. thermophillus
D. none of these
8. Changes in which of the following characterizes mutations?
A. Phenotype
B. Genotype
C. Both A and B
D. None of these
9. Transmission of hepatitis G virus is
A. Parenterally
B. Sexually
C. Both A and B
D. None of these
10. Which of the following enzyme is used for synthesis of RNA under the direction of DNA?
A. RNA polymerase
B. DNA ligase
C. DNA polymerase
D. RNA ligase
11. Culture of tubercle bacilli may be positive if number of bacteria in the specimen is
A. as few as 1-4 per ml
B. as few as 5-9 per ml
C. as few as 10-100 per ml
D. as few as 125-200 per ml
12. Which of the following is a food infection?
A. Salmonellois
B. Botulism
C. Staphylococcal intoxication
D. None of these
13. Which of the following media is selective for Salmonella?
A. Thiosulphate citrate bile salt agar
B. Wilson and Blair's brilliant-green bismuth sulphite agar medium
C. Bile salt agar
D. All of the above
14. Which of the following component of RNA polymerase facilitates the recognition of promoter sequences?
A. a subunit
B. b subunit
C. s subunit
D. c subunit
15. A cluster of polar flagella is called
A. lophotrichous
B. amphitrichous
C. monotrichous
D. petritrichous
16. Rapidly frowing Atypical organism involved in lung infection ?
A. m.chelonae
B. m.fortuitum
C. m.abscessus
D. M.kansasi
17. Which of the following is responsible for a musty or earthy flavor?
A. Actinomycetes
B. Flavobacterium
C. both A and
D.
18. The method of successful treatment of botulism prior to appearance of botulism symptoms involve administration of
A. antibiotic
B. analgesic
C. antitoxin
D. antipyretic
19. 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
20. Agglutination test for Brucella mainly identifies which class of antibodies?
A. IgG
B. IgM
C. IgA
D. IgE
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