Correct option B) Cell-cell recognition
Carbohydrates in cell membrane is major components which placed on the outermost surface of the cells bound to lipids or proteins. The membrane carbohydrates involved in cell adhesion and recognition which act as a physical barrier.
Uncharged molecules such as glucose cannot diffuse through membranes.Carbohydrates of the plasma membrane are major recognition and attaching sites for pathogens during infection.
Carbohydrates attached to proteins , stick out from the plasma membrane to define the cell's characteristics and help cells to identify chemical signals. If in case plasma membrane is absent, any type of nutrients can enter into the cell, causing harm to the cell internally.
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