Biology

The correct answer is: B.Transporting substances across the membrane

Integral proteins (also known as membrane proteins) are embedded within the lipid bilayer of the cell membrane and play a critical role in transporting substances across the membrane. These proteins can form channels or transporters that allow ions, nutrients, and other molecules to pass in and out of the cell.

Explanation of the other options:

A.Providing structural support to the membrane: While integral proteins contribute to the overall structure of the membrane, their primary function is not to provide structural support. This is more of a role for the phospholipids in the bilayer and cytoskeletal elements inside the cell....