bacteria morphology




1).
Which of the following bacteria lack a cell wall and are therefore resistant to penicillin?
A   Cyanobacteria   
B   Mycoplasmas   
C   Bdellovibrios   
D   Spirochetes   
ANS: B - Mycoplasmas

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2).
A cluster of polar flagella is called
A   lophotrichous   
B   amphitrichous   
C   monotrichous   
D   petritrichous   
ANS: A - lophotrichous

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4).
The protein from which hook and filaments of flagella are composed of, is
A   keratin   
B   flagellin   
C   gelatin   
D   casein   
ANS: B - flagellin

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5).
The cooci which mostly occur in single or pairs are
A   Streptococci   
B   Diplococci   
C   Tetracocci   
D   None of these   
ANS: B - Diplococci

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6).
Which of the following may contain fimbriae?
A   Gram-positive bacteria   
B   Gram-negative bacteria   
C   Both (a) and (b)   
D   None of these   
ANS: B - Gram-negative bacteria

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7).
Peptidoglycan accounts for __________ of the dry weight of cell wall in many gram positive bacteria
A   50% or more   
B   About 10%   
C   11%+ 0.22%   
D   About 20%   
ANS: A - 50% or more

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8).
Bacteria having no flagella are unable to
A   move   
B   reproduce   
C   stick to tissue surfaces   
D   grow in nutrient agar   
ANS: A - move

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9).
Which of the following is true about cell wall of gram-positive bacteria?
A   It consists of multiple layers   
B   It is thicker than that associated with gram-negative bacteria   
C   It contains teichoic acids   
D   All of these   
ANS: D - All of these

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10).
The cell walls of many gram positive bacteria can be easily destroyed by the enzyme known as
A   lipase   
B   lysozyme   
C   pectinase   
D   peroxidase   
ANS: B - lysozyme

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