Question

which of the following statements about the structure of the plasma membrane is not correct? there are several types of proteins incorporated into the membrane phospholipid heads are hydrophilic and face outward it keeps all substances from entering and contaminating the cell it is a phospholipid bilayer

Explanation:

The plasma membrane is semi - permeable, not completely impermeable. It allows certain substances to pass through via various transport mechanisms like diffusion, facilitated diffusion, and active transport. So, it does not keep all substances from entering the cell. The other statements about the plasma membrane having multiple types of proteins, phospholipid heads being hydrophilic and facing outward, and it being a phospholipid bilayer are correct.

Answer:

it keeps all substances from entering and contaminating the cell