Question
Which one of the followings is correct for the trans membrane proteins in lipid bilayer?
They are absent in animal cells
They act as channel proteins
They are absent in plant cells
They are only externally located
Solution
B.
They act as channel proteins
Transmembrane proteins in lipid bilayer occur in many forms and are responsible for transferring specific solutes across cell membrane.
Channel proteins, from water - filled pores that extend across the lipid bilayer, when these pores are open, they allow specific solutes (usually inorganic ions of appropriate size and charge) to pass through them and there by cross the membrane.
