Question

A liver cell requires energy to move vitamins from an area of low concentration, across the cell membrane, to an area of high concentration. The process used by the liver cell is called A) osmosis. B) active transport. C) passive transport. D) facilitated diffusion.

Answer 1

Osmosis is the answer :)

Answer 2

The ‘process’ used by the “liver cell” is called B) Active transport.

Active transport is the mode of transporting molecules across a ‘semi-permeable membrane’ against their ‘concentration gradient’. It is therefore an ‘energy dependent processes’.  

Molecules get transported from regions of their low concentration to the regions of high concentration at the expense of energy as it happens in liver cells where vitamins are transported across the membrane from low to high concentrations.  

Active transport can happen at the utilization of ATP in ‘primary active transport’ or electrochemical gradient in ‘secondary active transport’.