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CB - Cell membranes

Cell Biology - Topic 2 - Transport across cell membranes

QuestionAnswer
The cell membrane is made of which 2 substances? Proteins and (phospho)lipids
What is the function of the cell membrane? To control what substances enter and exit the cell
What term describes a membrane that allows some substances to pass across but not others? selectively permeable
What are 2 examples of substances that could pass into a cell by diffusion? oxygen, glucose
What specific molecule passes into a cell by osmosis? water
Which type of transport does not require energy? passive transport
Which type of transport requires energy? active transport
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 down a concentration gradient, through a selectively permeable membrane.
Define active transport. The movement of ions from an area of low concentration to an area of high concentration, against a concentration gradient.
How would you describe a plant cell that had lost water due to osmosis? plasmolysed
How would you describe a plant cell that had gained water due to osmosis? turgid
What would happen to an animal cell in pure water? swell and burst
What would happen to an animal cell in a strong sugar solution? shrink
What cell structure in plant cells prevents the cell from bursting? cell wall
What cell structure in plant cells is where excess water is stored? vacuole
If a plant cell was placed in pure water would it gain or loose weight? Gain weight
Created by: StNiniansHS
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