Diffusion is the movement of particles ... which have an extremely high concentration of oxygen, the molecules pass into the blood cells, filling them up. Now with a high concentration of oxygen ...

This takes place when molecules diffuse across the cell membrane ... The proteins pump sodium out of the cells and potassium into the cells. This helps nerve cells to transmit nerve impulses.

Many of these proteins are embedded into the membrane and ... On the other hand, cell membranes restrict diffusion of highly charged molecules, such as ions, and large molecules, such as sugars ...

which bind to signaling molecules outside the cell and subsequently transmit the signal through a sequence of molecular switches to internal signaling pathways. Membrane receptors fall into three ...

Scientists have transformed RNA, a biological molecule present in all living cells, into a biosensor that can detect tiny chemicals relevant to human health. Research by scientists centers on RNA, a ...