Select from the dropdown lists to complete the text.
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 )