Active Transport

• What does active transport need?


  energy
• Why does active transport need energy?


  To move molecules and ions across membranes, (usually) against a conc gradient
• 2 main difference between active transport and facilitated diffusion - summarise?


  • Concentration gradient direction
  • Energy
• What is one difference between active transport and facilitated diffusion?

  AT USUALLY moves solutes from a low to high conc whilst facilitated diffusion ALWAYS moves solutes from a high to low conc
• What is one difference between active transport and facilitated diffusion??

  AT requires energy facilitated diffusion does not
• What is ATP a common source of?

  Energy in the cell
• How is ATP produced?


  By respiration
• What does ATP undergo to release energy so that solutes can be transported?

  A hydrolysis reaction - splitting into ADP and Pi
• Give another between active transport and facilitated diffusion??

  Active transport does not use channel proteins

  Facilitated diffusion does
• What proteins does active transport NOT use?

  channel proteins
• What proteins does active transport use?

  carrier proteins