It is a cell wall that surrounds the cell outside its cell membrane
All cells have a protective covering called the cell membrane, also known as the plasma membrane. It surrounds the cell and regulates the passage of substances in and out of the cell.
protective covering (a lead apron)
Cell membreneA layer that controls what enters and what leaves the cell. Or a protective covering enclosing the entire cell.(controls substances going in and out of the cell.)
Armor.
cornea
The protective covering on the package was damaged. She is as protective as a mother hen.
The skin (or hide) and fur are the protective covering of a raccoon.
it's shell..
tegument!
Enamel.
Yes!
Its the cell membrane (or plasma membrane), composed of phospholipid bilayer ,membrane proteins and cholesterol in eukaryotes. the regulation is largely by way of signalling molecules that interact with specefic receptors on the membrane (mostly proteins or glycoproteins). hope that helps Dr. David