Many cells in multicellular organisms are specialised. They have specific roles in the organism of which they are part. Their structure is adapted to their function. They are often grouped ...

Cell membranes protect and organize cells. All cells have an outer plasma membrane that regulates not only what enters the cell, but also how much of any given substance comes in. Unlike ...

When proteins bind with other molecules, their conformation can change in subtle or dramatic ways. Not surprisingly, protein functions ... cell. Cells also secrete various proteins that become ...