biology

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    Cards (47)

    • how to test for starch, protein and lipids
      add food sample to test tube, add solution and shake
    • what colour do sudan ||| test turn if there is lipids?

      red
    • What test is for proteins?

      Biuret test
    • what colour do biuret test turn if there is protein?

      purple
    • what test is for starch?
      Iodine test
    • what colour do iodine test turn if there is starch?

      black
    • what test is for sugars?
      Benedict's test
    • what colour do benedicts test turn if there is sugars?

      green yellow or red
    • What is the main topic of today's video?
      Osmosis and its application to cells
    • What is diffusion?
      Net movement of particles from high to low concentration
    • How do oxygen and glucose molecules enter a cell?
      By diffusing down their concentration gradient
    • What is osmosis?
      Diffusion of water molecules across a membrane
    • What does the term "water concentration" refer to?
      Amount of water compared to dissolved solutes
    • What are solutes in the context of water concentration?
      Substances like sugars or salts dissolved in water
    • How does solute concentration affect water concentration?
      • Higher solute concentration means lower water concentration
      • Lower solute concentration means higher water concentration
    • If one beaker has one solute particle and another has three, which has higher solute concentration?
      The beaker with three solute particles
    • What determines the concentration of water in a solution?
      The proportion of water compared to solutes
    • How does osmosis occur in cells?
      • Water moves from higher to lower water concentration
      • Occurs across a partially permeable membrane
    • What is the state of the outside solution in the cell example given?
      Almost pure water with few solutes
    • Why does water diffuse into the cell in the example?
      Because the outside has higher water concentration
    • What is the process of water moving into the cell called?
      Osmosis