Question

fill in the blank question
the plasma membrane of a cell easily transports potassium ions across the membrane while inhibiting the transport of iron, demonstrating that the plasma membrane is a
permeable membrane.

Explanation:

The plasma membrane allows certain substances (like potassium ions) to pass through more easily while restricting others (like iron). This property is known as selective (or semi - ) permeability. So the word that fits in the blank is "selectively" (or "semi - ").

Answer:

selectively (or semi - )