Final answer:
When polar chemicals are added to the cell membrane, ions are no longer able to pass through easily due to the hydrophobic nature of the membrane's interior; they require transmembrane proteins to facilitate their movement.
Step-by-step explanation:
The question deals with the effect of adding or removing chemicals to cell membranes and how it impacts the passage of certain substances through the membrane. The correct choice regarding what happens when specific chemicals are added to or removed from cell membranes is option (A) Polar, Added, Ions, Through. As polar substances and ions present problems for the membrane, when polar chemicals are added, ions are blocked from passing through due to their charge and the hydrophobic interior of the cell membrane. In this situation, the ions require a special means of penetration such as via transmembrane proteins.