IDNLearn.com offers a seamless experience for finding and sharing knowledge. Ask anything and receive thorough, reliable answers from our community of experienced professionals.
To perform these roles, the plasma membrane needs lipids, which make a semi-permeable barrier between the cell and its environment. It also needs proteins, which are involved in cross-membrane transport and cell communication, and carbohydrates (sugars and sugar chains), which decorate both the proteins and lipids and help cells recognize each other.