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The two sides of the plasma membrane have different lipid and protein composition. EXPLANATION: Because the membrane serves different functions on the cytoplasmic and exterior surfaces, the structure and composition of the surfaces must be different. 2 Which of the following best describes the structure of a biological membrane? two layers of phospholipids with proteins either crossing the layers or on the surface of the layers explanation:
Question: Biological membranes are semipermeable: Some molec... Show transcribed image text Biological membranes are semipermeable: Some molecules are able to enter easily, but others are not. Sort these molecules or ions depending on their method of crossing biological membranes. Note that some of these examples may also pass through a membrane by an active transport process. However, this question asks only about passive transport processes.