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6 Cards in this Set
- Front
- Back
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Active Transport |
Needs energy in the form of ATP. If diffusion cannot meet needs of cell/isn't quick enough. The direction of transport is against the concentration gradient |
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Carrier Proteins |
Carrier proteins have specific regions that combine reversibly with only certain solute or molecules. This is where active transport occurs. |
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Method of Active Transport |
Shape of carrier protein is complementary to the molecule they carry: 1 - Binding 2 - Carrier protein changes shape 3 - Molecule transported across membrane One way flow: Molecule can only fit into carrier protein on one side of membrane |
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Examples of Active Transport |
Uptake of Mg2+ ions by plant root hair cells Uptake of K+ ions by plant guard cells |
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Bulk Transport |
Moving large quantities - in (endocytosis) & out (exocytosis) Fusing and pinching off of membranes Energy is used to form vesicles & to move vesicles around the cell using cytoskeleton threads. |
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Examples of Bulk Transport |
Hormones: Insulin released into blood by pancreatic cells Plant Cells: Vesicles carry materials to make cell walls WBC (phagocytes): Engulfing foreign invaders and fusion with lysosomes Phagocytosis: Uptake of solid matter Pinocytosis: Uptake of liquids - water |
