Question

Both prokaryote and eukaryote cells have this structure. It helps maintain homeostasis and is a boundary between the inside of the cell and the outside environment. It is the A) nucleus. B) membrane. C) cytoplasm. D) cell wall.

Answer 1

They both have a membrane

Answer 2

Answer: The correct answer is B) Membrane.

A cell membrane is present around the cytoplasm of all cells. It is a protective, selectively permeable membrane of the cells that regulates the transport of molecules in and outside the cell. It acts like a boundary that separates the cell interior from its external environment and helps in maintaining homeostasis.

On the contrary, nucleus is present in eukaryotes only and cytoplasm is not a boundary rather a fluid compartment of the cell. Cell wall ( around cell membrane) is not present in animals, which are eukaryotes.

Thus, B) Membrane is the right answer.