Question

one of the requirements of maintaining homeostasis in a cell is the regulation of materials that are allowed into and out of the cell. which cell - structure has a purpose most similar to the door of a building?
cell wall
cytoplasm
cytoskeleton
cell membrane

Explanation:

The cell membrane controls the movement of substances in and out of the cell, similar to how a door controls entry and exit in a building. The cell wall provides structural support, cytoplasm is the jelly - like substance inside the cell, and cytoskeleton provides internal support and helps with cell movement.

Answer:

D. cell membrane