Question

Which of the following draws energy directly from the electrochemical gradient of a solute and only indirectly from the hydrolysis of ATP?

simple diffusion

facilitated diffusion

primary active transport

secondary active transport

Answer 1

Ans. Correct option is secondary active transport

Simple diffusion - it this type of transport energy is not required.

Facilitated diffusion - enegry may or may not be require. If required then energy will be in form of ATP.

Primary Active transport - in this type of transport energy required. But the energy is directly taken from ATP.

Secondary active transport - In this type of transport, it uses an electrochemical gradient which is generated by active transport, as an energy source to move molecules against their concentrations gradient, and does not require ATP directly as source of energy.

So the correct option is secondary active transport.