1. Which of the following bacteria lack a cell wall and are therefore resistant to penicillin?

A. Cyanobacteria
B. Mycoplasmas
C. Bdellovibrios
D. Spirochetes

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2. A cluster of polar flagella is called

A. lophotrichous
B. amphitrichous
C. monotrichous
D. peritrichous

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3. Flagella move the cell by

A. many flagella beating in a synchronous, whip-like motion
B. an individual flagellum beating in a whip-like motion
C. spinning like a propeller
D. attaching to nearby particles and contracting

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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

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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

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