Question

Describe active and passive transport. Which relies on diffusion and which requires ATP? What are the different types of passive transport? What are primary and secondary active transport?

Answer 1

Active transport - Active transport refers to the movement of the molecules from the lower concentration compartment to the higher concentration compartment mediated via the chemical energy

Passive transport - Passive transport refers to the movement of the molecules from the higher concentration to the lower concentration mediated via diffusion and doesn't require energy.

Passive transport relies of diffusion and active transport requires the ATP.

The different types of passive transport are - simple diffusion, facilitated diffusion, osmosis .The simple diffusion refers to the Movement of the small molecules or gases via diffusion. The facilitated diffusion refers to the movement of the charged molecules with the help of membrane proteins. The osmosis refers to the movement of the water or fluid mediated via the solute concentration.

Primary active transport is the direct movement of the molecules mediated via the ATP hydrolysis. The secondary active transport refers to the movement of the molecules which is carrier mediated along the electrochemical gradient.