If a membrane allows some molecules to pass, it is called semi or differentially _________blank.

If a membrane allows some molecules to pass, it is called semi or differentially permeable.

Explanation

A semi-permeable membrane is a type of biological or synthetic membrane that will allow certain molecules or ions to pass through it by diffusion—and occasionally by specialized facilitated diffusion—while blocking others. This selective permeability is crucial for various biological processes, including the regulation of substances entering and leaving cells. For instance, cell membranes, primarily composed of a phospholipid bilayer, have proteins embedded in them that allow specific ions and molecules to pass while preventing others. This characteristic is essential for maintaining homeostasis within the cell by controlling the internal environment against external factors. Hence, a semi-permeable membrane plays a vital role in filtration, osmosis, and the overall functionality of cells.