One difference between human cheek cells and onion cells is
the presence of cytoplasm
the absence of a nucleus in the onion cells
the absence of a cell wall in cheek cells
none of the above

The absence of a cell wall in cheek cells

Human cheek cell do not have cell wall but possess nucleus and cytoplasm. Thus cytoplasm present in human cheek cell is denser, granular and occupies larger space while its vacuoles is smaller in size. However, onion cell possess cell wall and larger vacuoles which is found at the center of the cell.

The correct answer for the blank is -

the absence of a cell wall in cheek cells.

Cheek cells are the animal cells whereas onion cells are the plant cells.

Cell wall can be described as a rigid layer, composed of polysaccharides (such as cellulose in higher plants) and present outside the plamsa membrane ( also called cell membrane) in case of plants, fungi, and bacteria.

It is absent in animal cells, such as human cheek cells (which possess only cell membrane, surrounding the cytoplasm of cell).

Thus, cell wall is absent in cheek cells whereas present in onion cells.

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