Question

question 12 (1 point) integral membrane proteins they are completely embedded within the lipid bilayer. they are weakly bound to the surface of the membrane. they are only located on the inner side of a membrane they are firmly bound to the membrane. they have no hydrophobic portions.

Explanation:

Integral membrane proteins have hydrophobic regions that interact with the lipid - bilayer and are firmly bound to the membrane. They can span the entire lipid - bilayer or be partially embedded. The option that they are firmly bound to the membrane best describes them. The first option is too limiting as they can be partially embedded too. The second option describes peripheral membrane proteins. The third option is incorrect as they can be on both sides or span across. The fifth option is incorrect as they have hydrophobic regions to interact with the lipid - bilayer.

Answer:

They are firmly bound to the membrane.