Question

Which one of the following is correct for the transmembrane proteins in lipid bilayer of plasma membrane?

• A. They are absent in animal cells
• B. They act as channel proteins
• C. They are absent in plant cells
• D. They are only externally located

Answer 1

The correct option is B They act as channel proteins

In the fluid mosaic model of plasma membrane, membrane proteins can be classified as integral or peripheral. Peripheral proteins lie on the surface of membrane while the integral proteins are partially or totally buried in the membrane. Totally buried integral proteins are known as transmembrane protein. They are present both in animal and plant cells. They act as channel proteins.