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Definition
| Net movement of a substance from a region of greater concentration to lower concentration |
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Definition
transport of a substance across a cell membrane by diffusion
Expenditure of energy is not required |
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Definition
The pressure of water on the cell well
Caused by different concentration differences in solutes |
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The pressure of the cell's contents against the cell wall
Determined by the water concent in the central vacuole
Water pressure in a plant |
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Definition
| The movement of molecules across cell membranes through protein channels and carrier proteins |
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Term
| Glucose Permease Protein Channels |
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Definition
Glucose permease is the transporter protein specially designed to facilitate the membrane crossing of glucose
Specific to shape of glucose; like a lock, need right shape key
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Term
| Selectively Permeable Membrane |
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Definition
A membrane that only certain size molecules can enter and leave
Cell has limited control over what enters and leaves |
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Definition
| WATER passes through a selectively permeable membrane from region of higher concentration to lower |
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Definition
| Allows all substances to pass through |
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Definition
Liquid in which solutes dissolve
Water is the universal solvent |
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Term
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Definition
Lesser concentration particles that dissolve in solvent
Acids |
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Term
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Definition
Over active
More solutes
Less solvent; water
HYPO TO HYPER |
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Definition
Under active
Less solutes
More solvent; water
HYPO TO HYPER |
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Definition
Same concentration of solutes
Same solution |
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Term
| Factors determing whether substance can pass through membrane |
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Definition
- Concentration Gradient - when there is an uneven distribution of a substance across a border
- Molecular Weight - Molecular weight is simply the weight of all the atoms in a substance
- Solubility - the maximum amount of a solute which will dissovle in a given amount of solvent at a fixed temperature
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Term
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Definition
The most important producer
Live in ocean
Can be found on glass shells |
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Term
| Factors Determining Permeability |
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Definition
- Solubility in water - can in dissolve in water
- Solubility in lipids
- Phase of matter - gas, liquid, solid
- Electrical charge
- Shape
- Molecular weight (size) - atomic mass units
Biggest molecule is DNA |
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Definition
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Matter is always in motion
Back and forth equally |
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Term
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Definition
Excessive cell water loss
Often leads to death of plant |
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Term
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Definition
Diffusion requiring cell energy (ATP)
Against concentration gradient |
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Term
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Definition
Taking in of matter by a cell
Entering cell
Phagocytosis - wherein large particles are enveloped by the cell membrane of a (usually larger) cell and internalized to form a phagosome, or "food vacuole."
Pinocytosis - a process in which small particles are taken in by a cell by splitting into smaller particles |
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Term
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Definition
Waste leaves the cell
A process by which the contents of a cell vacuole are released to the exterior through fusion of the vacuole membrane with the cell membrane |
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