Diffusion and osmosis

• What is active transport?

  Movement of molecules against concentration gradient
• How does active transport differ from diffusion?

  Active transport requires energy, diffusion does not
• What is the direction of molecule movement in active transport?

  From low concentration to high concentration
• What type of membranes does active transport occur across?

  Semi-permeable membranes
• What is the energy requirement for diffusion?

  No energy needed
• What is the energy requirement for osmosis?

  No energy needed
• What is the direction of movement in osmosis?

  From high to low concentration
• What cellular organelle is abundant in cells that perform active transport?

  Mitochondria
• What is the process of active transport?

  • Moves substances against concentration gradient
  • Requires energy (ATP)
  • Opposite of passive transport
  • Accumulates high concentrations of needed molecules
• What substances are commonly accumulated through active transport?

  Ions, glucose, and amino acids
• What is the definition of passive transport?

  No energy required for movement
• Why is active transport considered the opposite of passive transport?

  Active transport requires energy, passive does not
• How does the concentration gradient affect active transport?

  Active transport moves substances against the gradient
• What is the relationship between energy and active transport?

  Active transport requires energy to function