FSC Biology MCQs

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Which of the following statement is incorrect regarding germ theory of diseases postulated by Robert Koch?
A. A specific organism can always be found in association with a given disease B. The organism can be isolated and grown in pure culture in the laboratories
C. The pure culture cannot produce the disease when inoculated into susceptible animal however the causative organism isolated from pure culture can do so. D. It is possible to recover the organism in pure culture from the experimentally infected animals.
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[explanation]c[/explanation]
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10. Some bacteria ranging occasionally a size of 500 ?m in length are
A. Escherichia coli B. Spirochetes
C. Mycoplasma D. Epulopiscuim
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[explanation]b[/explanation]
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The first bacterium isolated was
A. Coccus B. Bacillus
C. Vibrio D. Spirochete
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[explanation]b[/explanation]
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Which of the following has a chain arrangement?
A. Streptobacillus B. Streptococci
C. Staphylococci D. Both A and B
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[explanation]d[/explanation]
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Which of the following structure primarily helps in attachment of bacteria on various surfaces?
A. Flagella B. Pili
C. Both of these D. None of these
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[explanation]b[/explanation]
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Cell wall is absent in
A. Cocci B. Bacilli
C. Mycobacterium D. Mycoplasma
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[explanation]d[/explanation]
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Extremely long molecule of DNA that is tightly folded to fit inside the cell component is called
A. Nucleus B. Chromosome
C. Chromatid D. Chromatin body
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[explanation]d[/explanation]
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Purple non-sulphur bacteria is an example of
A. Heterotrophic bacteria B. Chemosynthetic bacteria
C. Photosynthetic bacteria D. Saprotrophic bacteria
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[explanation]c[/explanation]
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Those bacteria which are fully dependent upon their host for nutrition are called
A. Heterotrophic bacteria B. Chemosynthetic bacteria
C. Saprophytic bacteria D. Parasitic bacteria
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[explanation]d[/explanation]
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Cyanobacteria have _____ cell wall
A. Gram +ve. B. Gram – ve.
C. Acid fast D. Cellulose rich
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[explanation]b[/explanation]
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