Plant cells (the onion skin cells) have a cell wall, while animal cells (cheek cells) only have the cell membrane.
A cheek is an animal cell, therefore circular. A onion cell, however, is rectangular because it's a plant cell.
The cell wall
An animal cell's structure is flexiable while a plants cell's structure is rigid
The human epithelial cells are thick and boxlike whereas elodea cells are thin and platelike. The cells of elodea are rigid and rectangular in shape.
The cell wall is a rigid supporting structure.
You are referring to the cellulose cell wall.
Each plant cell has a rigid outer layer called a cell wall. Animal cells do not have this structure.
Onion cells, like most plant cells, have rigid cell walls which give them a regular shape. They are stacked tightly in columns and rows. Cheek cells have and irregularly shaped cell membrane. and are squished together in layers.
The root cell's job is to gather minerals and and take it up the roots to the onion.
Because plant cells have a rigid cell wall
An animal cell's structure is flexiable while a plants cell's structure is rigid
The human epithelial cells are thick and boxlike whereas elodea cells are thin and platelike. The cells of elodea are rigid and rectangular in shape.
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The cell wall is a rigid supporting structure.
You are referring to the cellulose cell wall.
Each plant cell has a rigid outer layer called a cell wall. Animal cells do not have this structure.
The difference between a structure that is rigid and one that is flexible is that the rigid structure will not bend or flex when force is applied. A structure that is rigid cannot flex.
It is the cell membrane. Plant cells also have a rigid structure called a cell wall.
Because a plant has no skeleton, its support is found in it's cells. The cells have a rigid cell wall for support and structure.