Cell Membrane Control Practice Test

Two simplified cell models are shown.

Model 1: A cell boundary labeled cell membrane with inside shaded green. Arrows show oxygen (O) entering and carbon dioxide (C) leaving. A large particle labeled “protein chunk (P)” is blocked at the boundary.

Model 2: Same cell and boundary, but now the arrow for protein chunk (P) crosses into the cell.

Both models include the statement: “The membrane regulates exchange.”

What is the best prediction about what changed in Model 2?

A model shows a cell with a visible boundary labeled cell membrane. The inside is shaded pink and the outside is white. Arrows show: “ion (I)” entering, “water (W)” entering, and “large droplet (L)” blocked at the boundary (arrow stops). The model states: “The membrane regulates exchange.”

If the membrane changed so it became less controlling of what crosses the boundary, which prediction is most supported?