Question

Which of these analogies best describes the cell membrane

The cell membrane acts like a sorting machine. It allows everything into the cell but organizes it.
The cell membrane acts like a wall. It does not allow anything to pass into the cell.
The cell membrane acts like a military checkpoint. It allows some substances to pass through but keeps others out
The cell membrane acts like a storage center. It keeps helpful substances inside of it until the cell needs them.

Answer 1

The cell membrane acts like a military checkpoint. It allows some substances to pass through but keeps others out

Step-by-step explanation: