Question

1. which characteristic of a cell membrane allows it to control materials entering and leaving a cell?

a cell membrane is surrounded by fluid.
a cell membrane is semipermeable.
a cell membrane holds organelles in place.
a cell membrane is found in plant and animal cells.

Explanation:

The cell membrane's semipermeability means it can regulate what substances pass through. Being surrounded by fluid (A) doesn't explain control of materials. Holding organelles (C) is about internal structure support, not material control. Being in plant and animal cells (D) is a distribution fact, not a functional one for material control.

Answer:

B. A cell membrane is semipermeable.