Question

which of the following is a similiraity between faciliated diffiusion and active transport?

a) both use ATP

b) both move solutes up their concentration gardients

c) they both create a state of equilibrium between extracellular fluid and the intracellular fluid

d) they both use carrier protein

e) both are passive proccess

Answer 1

Answer- D they both use carrier protein

Active transport is the movement of molecules across a cell membrane in the direction against their concentration gradient, i.e. moving from a low concentration to a high concentration. Active transport is usually associated with accumulating high concentrations of molecules that the cell needs, such as ions, glucose and amino acids. It requires ATP.

Examples : Uptake of glucose in the intestines in humans and the uptake of mineral ions into root hair cells of plants.

In facilitated diffusion small polar molecules and ions diffuse through passive transport proteins. Down the electrochemical gradient and No energy needed. Polar, hydrophilic substances cannot pass directly through the lipid bilayer. Most passive transport proteins are solute specific

     Examples : water, ions and carbohydrates.