Biology 2nd Edition by Robert Brooker, Eric Widmaier ,Linda Graham ,Peter Stiling

تمرين 13

Which of the following statements best describes the chemical composition of biological membranes
A) Biological membranes are bilayers of proteins with associated lipids and carbohydrates.
B) Biological membranes are composed of two layers-one layer of phospholipids and one layer of proteins.
C) Biological membranes are bilayers of phospholipids with associated proteins and carbohydrates.
D) Biological membranes are composed of equal numbers of phospholipids, proteins, and carbohydrates.
E) Biological membranes are composed of lipids with proteins attached to the outer surface.