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Cell Membranes

Transport across cell membranes

QuestionAnswer
What 2 substances make up the cell membrane? proteins and phospholipids
What term would describe a membrane that only allows certain molecules pass through? selectively-permeable
Name 2 examples of small molecules that can pass through a membrane. oxygen, carbon dioxide, water, glucose, amino acids, etc.
Name 2 examples of large molecules that cannot pass through a membrane. starch, protein, fat, red blood cells, etc.
What 3 conditions may damage the structure of the cell membrane? acids, high temperatures, alcohol.
Why is it important that substances are able to pass across the cell membrane? to receive nutrients and expel waste products
What are 2 examples of passive transport across the membrane? diffusion and osmosis
Define diffusion. The movement of molecules from an area of high concentration to an area of low concentration down a concentration gradient.
Define osmosis. The movement of water molecules from an area of high water concentration to an area of low water concentration through a selectively permeable membrane.
What would happen to an animal cell which has been placed in pure water? cell would swell and burst
What would happen to an animal cell which has been placed in a concentrated sugar solution? cell would shrink and shrivel
What would happen to a plant cell which has been placed in pure water? cell would become turgid
What would happen to a plant cell which has been placed in a concentrated salt solution? cell would become plasmolysed
When a plant cell becomes turgid, where is most of the water stored? vacuole
Which structure in the plant cell prevents the cell from bursting when placed in pure water? cell wall
Define active transport. The movement of molecules (ions) from an area of low concentration to an area of high concentration against a concentration gradient.
What is the main difference between passive and active transport? Passive transport does not require energy, active transport does require energy.
In which cell structure is the energy for active transport produced? mitochondria
Which 3 letters represent the scientific name for 'energy'? ATP
Created by: Kyle.Academy