Bacteria Morphology
The cell wall of

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

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Bacteria Morphology
Flagella move the cell by

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

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