Question

Why do certain substances require special protein channels to pass through the plasma membrane?answer in 3 to 4 lines. ​

Answer 1

Answer:

Certain substances require special protein channel to pass through the plasma membrane because plasma membrane is selectively permeable which means it allows only a selective materials to pass through it thatswhy some substance required special protien to pass throught it. it does not allow bacteria and other infectious substance to pass throught it and harm the cell.