Question

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

a. Membrane carbohydrates function primarily in cell-cell recognition.Variations in carbohydrate structure distinguish one species from another, one individual from another, and even one cell type from another.
b. On the outside (external) surface of the membrane.Membrane carbohydrates are covalently bonded to lipids or proteins and extend out from the external side of the plasma membrane as a means of cell identification.
c. Proteins embedded in two layers of phospholipid. With the proteins embedded, the cell retains its general restriction for polar molecules crossing the membrane, while the proteins provide for selective transport functions.

Answer 1

b. On the outside (external) surface of the membrane. Membrane carbohydrates are covalently bonded to lipids or proteins and extend out from the external side of the plasma membrane as a means of cell identification.

Step-by-step explanation: