Question

which statement about the cell membrane is true?
it contains cellulose and sugars that are involved in communication.
it is present in animal cells only.
it is rigid and elastic for supporting the cells shape.
it prevents harmful substances from entering a cell.

Explanation:

Cell membrane is a selectively permeable membrane. It allows only selected substances to pass through it and prevents harmful substances from entering the cell. Cellulose is present in cell wall (not cell membrane). Cell membrane is not rigid. It is present in both plant and animal cells.

Answer:

It prevents harmful substances from entering a cell.