Bacteria Morphology
The cell wall of

both have same thickness but composition is different
gram-negative bacteria are thicker than gram-positive bacteria
gram-positive bacteria are thicker than gram-negative bacteria
none of these

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Bacteria Morphology
Flagella move the cell by

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

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