__ attached to proteins, stick out from the plasma membrane to define the cell's characteristics and help identify chemical signals. Might help fighting cells to recognize and attack a potentially harmful cell.

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Carbohydrate groups attached to proteins, stick out from the plasma membrane to define the cell's characteristics and help identify chemical signals.

Carbohydrate groups are present only on the outer surface of the plasma membrane and are attached to proteins, forming glycoproteins, or lipids, forming glycolipids.Carbohydrates are divided into four major groups based on the degree of polymerization: monosaccharides, disaccharides, oligosaccharides, and polysaccharides.Carbohydrates are probably the most abundant and widespread organic substances in nature, and they are essential constituents of all living things. Carbohydrates are formed by green plants from carbon dioxide and water during the process of photosynthesis. Carbohydrates serve as energy sources and as essential structural components in organisms; in addition, part of the structure of nucleic acids, which contain genetic information, consists of carbohydrate.

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