Question

osmosis across a cell membrane can be modeled using a u - shaped tube. one solution is poured into one end of the tube, and another solution is poured into its other end. both solutions are made by dissolving a solute such as salt in water, but the two solutions do not have the same concentration. at the bottom of the tube, there is a semipermeable membrane that represents a cell membrane. complete the sentences. a cell membrane is semipermeable, meaning it molecules to pass through it. to model osmosis across a cell membrane, the scientists who created this model used a semipermeable membrane that water to pass through it.

Explanation:

A semipermeable cell membrane allows certain (some) molecules to pass through (selective permeability). In the osmosis model, the semipermeable membrane in the U - tube is designed to allow water (the solvent) to pass through, which is consistent with how osmosis (movement of water across a semipermeable membrane) works. So for the first blank, since it's semipermeable, it allows some molecules. For the second blank, in the osmosis model, the membrane allows water to pass to model the osmotic movement of water.

Answer:

First blank: "allows some"
Second blank: "allows"