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UNIT 4 - NCERT
www.ncert.nic.in11.1.3 Active Transport Active transport uses energy to pump molecules against a concentration gradient. Active transport is carried out by membrane-proteins. Hence different proteins in the membrane play a major role in both active as well as passive transport. Pumps are proteins that use energy to carry substances across the cell membrane.
Diffusion, Osmosis, Active Transport - BiologyMad
biologymad.comActive Transport Active transport is the energy-demanding transfer of a substance across a cell membrane against its concentration gradient, i.e., from lower concentration to higher concentration. Special proteins within the cell membrane act as specific protein ‘carriers’.