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 CELLS

MEMBRANE TRANSPORT PROTEINS

Active Transport

  • Uses energy.

  • Faster than diffusion.

  • Can move against a concentration or electrochemical gradient

  • Uses carrier proteins – very specific selective transport

Evidence of active transport in marine algal cells

 

 

Concentration / m mol dm-3
Ion Sea water Cell sap
Sodium (Na+) 488 257
Potassium (K+) 012 337
Chloride (Cl- 523 543

 

© Paul Billiet 2009