Question

Channels within the structure of the cell membrane are composed of A) carbohydrates. B) disaccharides. C) phospholipids. D) proteins.

Answer 1

I believe the answer is: D. proteins

The main functions of these proteins is to allow specific substance to pass through the membrane of the cells which needed for the energy formation for cells'functions.It created through the combination of more than 20 amino acids with different functions.

Answer 2

its proteins

Proteins. The channels within the cell membrane are composed of  

three dimensional proteins that allow the passage of specific molecules or charged atoms.