Active transport & rate of active transport

• what does active transport require?


  energty
• what does active transport do?


  Uses energy to move molecules and ions across membranes, usually against a concentration gradient
• What are the TWO MAIN DIFFERENCES between active transport and facilitated diffusion?


  1. Active transport USUALLY moves solutes from a low to high concentration, whilst in facilitated diffusion they ALWAYS move from a high to low concentration
  2. Active transport REQUIRES ENERGY, whilst facilitated diffusion does NOT
• What is a common source of energy in the cell?


  ATP
• How is ATP PRODUCED?


  By respiration
• What does ATP undergo?


  • ATP undergoes a hydrolysis reaction, splitting into ADP and Pi
  • This releases energy so that the solutes can be transport
• give another difference between facilitated diffusion and active transport?


  active transport doesn't use channel proteins but FACILITATED DIFFUSION DOES USE CHANNEL PROTEINS