13. Which of the following statements concerning carbohydrates associated with the plasma membrane is correct?
(A) Membrane carbohydrates function primarily in cell-cell recognition.
(B) Carbohydrates on the plasma membrane are typically short chains of between two and five monosaccharides.
(C) Carbohydrates are only found associated with the membranes of prokaryotic cells.
(D) Carbohydrates associated with the plasma membrane are located on both surfaces of the membrane.

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