Onion peel cell has a hexagonal shape and bacterial have different shapeslike oval
Onion peel have cell wall whereas bacterial don't.
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Bacterial cell:
i) All organelles of bacteria are not membrane bound.
ii) The genetic material is not bound in a nucleus.
iii) The cytoplasm present does not have any role in maintaining the shape of the bacterial cell.

Onion cell:
i) All the organelles present are membrane bounded.
ii) The genetic material is bound in the nucleus.
iii) The cytoplasm (and other organelles like vacuoles etc.,) have a role in maintaning the onion cell's shape. 
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