Question

what is plasma membrane?

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Answer 1

Answer:

a microscopic membrane of lipids and proteins which forms the external boundary of the cytoplasm of a cell or encloses a vacuole, and regulates the passage of molecules in and out of the cytoplasm.

Answer 2

Answer:

• The plasma membrane is the cell's outermost layer.
• It isolates the contents of cells from their surroundings.

Explanation:

• It permits materials from outside the cell to enter and escape. It also permits the contents of the cell to exit to the outside.
• It is called a selectively permeable membrane because it controls the entry and exit of materials into and out of the cell.
• Diffusion allows gases such as carbon dioxide or oxygen to move from a high concentration to a low concentration in a cell across the cell membrane.
• The process of osmosis also permits water to flow in and out of the cell depending on the concentration outside the cell.