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1.) Transmit signals to the inside of the cell, serve as support structures for the membrane, and move needed substances and wastes through the membrane.------ ( Proteins, Cholesterol, Carbohydrates )
2.) Prevents the fatty acid tails of the phospholipid bilayer from sticking together and contributes to the fluidity of the membrane.------- ( Proteins, Cholesterol, Carbohydrates )
3.) Define the cell’s characteristics and help cells identify chemical signals---- ( Proteins, Cholesterol, Carbohydrates )