Which substance on the plasma membrane identify chemical signals from outside the cell?
question 19 options:

carbohydrate chain

cholesterol

membrane protein

transport protein

The correct answer is carbohydrate chain.

Explanation:

Plasma membrane contain three types of protein  a peripheral protein b transmembrane protein and c GPI anchored protein.

    Some membrane protein basically peripheral proteins contain oligosaccharide chain arranged towards the extracellular region of the plasma  membrane with respect to the surface of that glycoprotein.

   The oligosaccharide chain of glycoprotein play an important role in to identify signals from outside the cell.These signals may include the entry of virus particles inside our body,protein targeting etc.

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