Which statements describe the cell membrane? Check all that apply. It only allows certain materials to leave the cell. It allows all materials to leave the cell. It only allows certain materials to enter the cell. It allows all materials to enter the cell. It helps the cell get rid of waste. It brings waste into the cell for storage.
Answers
Answer:
It only allows certain materials to enter the cell.
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The correct statements are:
- It only allows certain materials to leave the cell.
- It only allows certain materials to enter the cell.
- It helps the cell get rid of waste.
The cell membrane also referred to as the plasma membrane, is a slender, flexible wall that encloses the cell and regulates what goes into and out of it. The membrane serves as a gatekeeper to control the flow of materials into and out of the cell because it is selectively permeable, allowing only specific materials to pass through.
A lipid bilayer, which is a double layer of phospholipids that forms a barrier to the movement of most substances, makes up the cell membrane. While ions and larger molecules need specialized transport proteins to cross the membrane, some substances, like oxygen and carbon dioxide, are small enough to diffuse through the lipid bilayer.
The cell membrane not only controls the flow of materials into and out of the cell, but it also aids in waste removal by allowing waste products to be expelled from the cell. It does not, however, transport waste into the cell for storage. As an alternative, the cell may employ specialized organelles, like lysosomes, to digest and eliminate waste.
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