Term
| Biological Membranes: list five characteristics |
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Definition
1. Phospholipid Bilayer.
2. 10 nm thick.
3. Differentially permiable.
4. Self Assembly.
5. Cholesterol, carbohydrate, and protein studded. |
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Term
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Definition
| Simple or facilitated diffusion which moves molecules across the biological membrane, down its concentration gradient. No ATP is used in this process. |
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Term
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Definition
| Pumps which move molecules against their concentration gradient using ATP. |
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Term
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Definition
| Channel that moves one molecule in one direction |
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Term
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Definition
| a transporter that moves two molecules in the same direction |
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Term
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Definition
| A transporter that moves two molecules in the opposite direction. |
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Term
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Definition
-70 mV in with respect to out.
Set up by the passive movement of molecules Na and K. There is more sodium out of the cell than inside and more potassium inside than out. Potassium is more permiable due to its smaller hydration shell, so more potassium leaves than sodium enters. |
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Term
| Unique characteristics of plants/plant cells. |
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Definition
Indeteminate growth.
Meristem
Central vacuole
Chloroplasts
Cell wall
Plasmodesmata |
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Term
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Definition
| Water carrying structures. |
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Term
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Definition
| Food carrying structures. |
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Term
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Definition
1. regulates cell volume/pressure
2. prevents cell migration
3. protects cell
4. lends strength and support |
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Term
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Definition
1. secondary metabolites
2. water
3. sugars
4. dissolved ions
5. enzymes |
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Term
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Definition
| for a solute, a state or condition in which there is no gradient of electrochemical potential and there for no net passive transport of the solute. |
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Term
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Definition
| condition in which influx and efflux of a given solute between two compartments separated by a membrane are equal. In the presence of active transport steady state will differ from equilibrium. |
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Term
| Biological Drivers of Transport |
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Definition
1. Electro chemical gradient
2. Hydrostatic pressure
3. Gravity
4. Concentration gradient |
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Term
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Definition
| Tracheids are more narrow and transport less water. |
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Term
| Angiosperms v Gymnosperms |
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Definition
| Angiosperms have vessels as they are flowering plants, which need more water and nutrients in order to keep replacing these flowers. Gymnosperms are conifers, which do not need to replace their needles. |
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Term
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Definition
| The movement of water through the open stomata of a leaf into the air. This pulls water up through the rest of the plant. |
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Term
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Definition
| The property of water to adhere to other substances. |
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Term
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Definition
| The ability of water to adhere to other water molecules, allowing transpiration to pull the entire water column upward. |
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Term
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Definition
| Stress placed on an object or substance due to pulling. |
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Term
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Definition
| pressure generated by compression of water into a confined space |
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Term
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Definition
| A Suberin covered strip which forced water and molecules to cross a membrane within the plant before moving into the vascular cavity. |
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