Active Transport

• What process allows substances to be absorbed against a concentration gradient?

  Active transport
• How does active transport differ from diffusion?

  Active transport moves substances against the gradient
• What is the energy source for active transport?

  Energy from respiration
• What is a concentration gradient?

  A difference in concentration across a space
• If a cell needs to bring in a molecule at high concentration inside, what process does it use?

  Active transport
• Why can't sugars diffuse into the cell from the lumen?

  Because their concentration is lower in the lumen
• What do mitochondria provide for active transport?

  Energy
• What ions do root hair cells transport into plants?

  Magnesium ions
• How do root hair cells use active transport?

  To move ions from soil into the cell
• Why do root hair cells have many mitochondria?

  To provide energy for active transport
• What are the key differences between active transport and diffusion?

  • Active transport moves substances against the concentration gradient
  • Diffusion moves substances down the concentration gradient
  • Active transport requires energy from respiration
  • Diffusion does not require energy