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Bella Nat 5

U1 KA 2 Transport across membranes

What is Diffusion The movement of molecules of a substance FROM their area of HIGHER concentration TO their area of LOWER concentration until they are evenly spread.
What happens to the rate of diffusion when there is a steeper concentration gradient It is faster
Name 2 substances that diffuse INTO cells in the tissues Oxygen, Glucose, Amino Acids, Water
Name 2 substances that can diffuse out of cells in the tissues Carbon dioxide, Urea Water
What do you call the holes found in cell membranes Pores (or channels)
What size must molecules be to be able to diffuse into and out of cells Small
What is the name we give to a membrane that chooses what can pass through it? Selectively permeable
What are the names of the 2 different types of molecule which make up the cell membrane Phospho-lipid molecules, Protein molecules
Is diffusion Active or Passive Passive
What does Passive mean Does not require Energy
What is Osmosis The name for the diffusion of water
Define Osmosis Osmosis is the movement of WATER molecules from their area of higher water concentration to their area of lower water concentration THROUGH A SELECTIVELY PERMEABLE MEMBRANE.
Is Osmosis Active or Passive Passive
Define Active transport The movement of molecules AGAINST their concentration gradient from an area of LOWER concentration to an area of HIGHER concentration.
Does Active Transport require energy? Yes
What happens to ALL cells when placed in 100% water? They GAIN mass by osmosis.
What happens to ALL cells when placed in a solutions of a lower water concentration? They LOSE mass by osmosis.
What happens to ALL cells when placed in a solution with the same water concentration as their cytoplasm? Nothing
What eventually happens to animal cells in solutions with a water concentration GREATER than the cell cytoplasm? BURST
What eventually happens to animal cells placed in a solution with a water concentration LESS than the cell cytoplasm? SHRIVEL
What eventually happens to PLANT cells in solutions with a water concentration GREATER than the cell cytoplasm? They swell up and become TURGID
What eventually happens to PLANT cells in a solution with a water concentration LESS than the cell cytoplasm? They shrivel and become PLASMOLYSED
What direction do molecules or ions move during active transport? Against the concentration gradient.
What molecule must be present in the cell membrane for active transport? Protein
Does active transport need energy? Yes
Name a molecule or ion that can be moved into or out of a cell by active transport. Sodium or Potassium or Iodine
Created by: nscobie
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