Cell membranes protect and organize cells. All cells have an outer plasma membrane ... components. Both types of membranes have a specialized structure that facilitates their gatekeeping function.

Cells are the smallest unit of life and the building blocks for all organisms. Each component of a cell has its own function. Animal and plant cells differ and they have similarities. Nucleus ...

New progress in a long-standing debate about the nature of biological cell ... of the membrane's structure, and the roles played by its molecular components in its overall function.

Because membrane receptors interact with both extracellular signals and molecules within the cell, they permit signaling molecules to affect cell function without actually entering the cell.