active transport

• What type of transport is active transport?

  ATP requiring process
• What does active transport move across membranes?

  Ions and molecules against a concentration gradient
• How does active transport differ from diffusion?

  It moves substances against a concentration gradient
• Why is active transport important for nutrient uptake?

  It allows uptake of solutes in low concentrations
• What is an example of a solute transported by active transport?

  Nitrate from soil water
• What happens to the pump during active transport?

  It changes shape after ATP transfer
• What processes involve active transport?

  Protein synthesis, muscle contraction, nerve impulses
• What does ATP transfer to the pump during active transport?

  A phosphate group
• What effect does cyanide have on active transport?

  It stops ATP production
• What happens to the rate of active transport as concentration gradient increases?

  Initial increase in uptake rate
• Why does the rate of active transport level off at high concentration differences?

  Pumps become full, limiting transport rate
• What happens to the rate of transport after adding a respiratory inhibitor?

  Rate sharply drops
• What is a respiratory inhibitor's effect on active transport?

  It stops ATP production