The energy necessary for active transport across cytoplasmic membranes is believed to come from
  1. ATP
  2. diffusion
  3. osmosis
  4. kinetic energy

AcademicBiologyNCERTClass 9

Correct Answer: (a) ATP


Active transport: Active transport is the movement of molecules across the cell membrane from the region of lower concentration to higher concentration, against the concentration gradient.

As this transport occurs against the concentration gradient, it required the spending of cellular energy in the form of ATP.

For example:

Sodium-Potassium (Na-K) pump that is required to maintain cell potential.

Updated on 10-Oct-2022 13:27:26