Four of the five answers listed below are bacterial structures. Select the exception.

A) cell wall
B) pilus
C) capsule
D) protein coat
E) plasma membrane

Pilus

A thin, hair-like structure on the surface of some bacteria that is involved in adherence to surfaces or in the transfer of genetic material.

Capsule

A small container or covering, often used for medication, or the outer layer of some plant seeds or spores.