Question

which structure provides a boundary between the cell and its environment in all three cell types?
capsule
cell wall
nuclear membrane
cell membrane

Explanation:

• The cell membrane (plasma membrane) is a fundamental structure in all cell types (prokaryotic, plant, and animal cells).
• It acts as a selective barrier, separating the cell's internal environment from the external environment.
• The capsule is mainly found in some prokaryotes (like bacteria) and is not present in all cell types.
• The cell wall is not present in animal cells.
• The nuclear membrane is only present in eukaryotic cells (surrounding the nucleus) and not in prokaryotic cells.

Answer:

Cell membrane