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Cell Function (4)

transport across cell membrane

QuestionAnswer
what does the cell membrane do? Encloses contents of cell and allows cytosol (water substance) to have different composition by allowing substances to move in and outside the cell.
Is the cell wall semipermeable? Yes, it allows some dissolved substances to move through it, but not others.
What do the cell membrane's structures allow? Larger particles to pass through it and allows movement against the concentration gradient and cytosol have different composition.
What is the cell membrane made up of? A double layer of phospholipids/bilayer of phospholipids.
What are Phospholipids? A major type of lipid (lipids - fats, oils or waxes).
What are the two different processes that transport dissolved substances across the membrane? Passive Transport and Active Transport.
Does Passive Transport require energy? No
What is Diffusion? The movement of molecules from a region of high concentration to a region of low concentration. Requires no energy
What is Channel Meditated Diffusion? When substances are to big to move across the membrane and are assisted by protein channels. Move from high to low and requires no energy?
What is Carrier Mediated Diffusion? When substances are required by cell but are to large to move across the membrane and are assisted by carrier molecules. Move from high to low and requires no energy.
What is Active Transport? When substances move across the membrane against the concentration gradient. This process does require energy.
What are the 3 types of Passive Transport? Diffusion, Channel mediated and Carrier Mediated.
Created by: zarap103
 

 



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