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