Bacteria Morphology
Flagella move the cell by

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

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Bacteria Morphology
The cell wall of

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

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