ACTIVE transport of sodium across cell membranes is now established as one of the fundamental physiological processes of most vertebrate cells. This process probably requires some sort of carrier ...

The link between nucleocytoplasmic transport and apoptosis remains controversial. On the one hand, nucleocytoplasmic exchange of molecules (reviewed in Ferrando-May et al. 1) seems essential for the ...

Diffusion Substances move from a high to a lower concentration down a concentration gradient Carbon dioxide, oxygen, water, food substances, wastes, eg urea No Osmosis Water moves from a high to a ...

Jamila and Megan have had a Halloween party and, after eating so many sweets and chocolates, they feel like they cannot eat another bite. When discussing transport to get home, Alfred, the science app ...