The alternative to active transport is passive transport, which uses kinetic energy only to move the molecules. Passive transport can only move molecules from a region of higher concentration to lower ...

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 ...

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 ...

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 ...