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Unformatted text preview: glycolipid s, or, more commonly, to proteins, forming glycoproteins . The oligosaccharides on the external side of the plasma membrane vary from species to species, individual to individual, and even from cell type to cell type within the same individual. This variation marks each cell type as distinct. The four human blood groups (A, B, AB, and O) differ in the external carbohydrates on red blood cells. B. Traffic Across Membranes 1. A membranes molecular organization results in selective permeability A steady traffic of small molecules and ions moves across the plasma membrane in both directions. For example, sugars, amino acids, and other nutrients enter a muscle cell and metabolic waste products leave. The cell absorbs oxygen and expels carbon dioxide....
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