Which substance on the plasma membrane identify chemical signals from outside the cell?
question 32 options:

carbohydrate chain

cholesterol

membrane protein

transport protein

carbohydrate chain

Explanation:

Cholesterol is more rigid than some of the other lipids in the membrane. Cholesterol keeps the fatty-acid tails of the phospholipids bilayer from sticking together, which contributes to the fluidity of the plasma membrane. The membrane would become rigid. Transport protein move needed substances or waste materials through the plasma membrane . Carbohydrate defines the cell characteristics and help cells identify chemical signals.

not sure if this is what you'r looking for eubacteria and archaebacteria