Question

Why there is important that there are different types of proteins in the plasma membrane for the transport of material in and out of the cell?

Short answer

There are specialized channels that facilitate the passage of materials through the membrane. So to pass all types of materials, the presence of proteins are must, inside and outside of the plasma membrane.

Step-by-step solution

Step 1. Introduction

There is a requirement for different types of proteins for transportation it's because these proteins are material-specific and don't allow any non-requiring material inside the cell.

Step 2. Explanation

The proteins are very useful channels as they work only for a specific ion or material which is required by the cell at a certain moment. If a single channel allows all types of materials through it then it might bring unwanted products into the cell and hinder its functions or damage the cell. Thus the specific proteins allow specific products and this helps in the normal functioning of the cell.