Transporters carry a molecule (such as glucose) from one side of the plasma membrane to the other. Receptors can bind an extracellular molecule (triangle), and this activates an intracellular process.

For example, biochemical reactions in a ... Prokaryotes generally use electron transport chains in their plasma membranes to provide much of their energy. The actual energy donors and acceptors ...

Cells are surrounded by a membrane - the plasma membrane - which acts as a physical barrier but must also be malleable. These properties are endowed by the constituent components of membranes - lipids ...