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Discussion

The glycocalyx on the outer surface of an animal cell is composed of

  • A.phospholipids arranged in a second bilayer
  • B.carbohydrate chains attached to lipids and proteins
  • C.a layer of cellulose fibres laid down outside
  • D.cholesterol molecules facing the extracellular fluid

Answer: B

These sugar chains are involved in recognition, adhesion and protection, and they distinguish one cell type from another during development and immune surveillance. The ABO blood group antigens are among the best known examples of such markers.

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