Which of the following statements concerning carbohydrates associated with the plasma membrane is correct?

• A. Carbohydrates are found associated with the membranes of prokaryotic cells only.
• B. The carbohydrate composition of most eukaryotic plasma membranes is quite similar.
• C. Carbohydrates on the plasma membrane are typically long, complex chains of several dozen monosaccharides.
• D. Carbohydrates associated with the plasma membrane are located on both surfaces of the membrane.
• E. Membrane carbohydrates function primarily in cell-cell recognition.