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12 Cards in this Set
- Front
- Back
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Membrane functions |
Keep all cell components inside cell Allow nutrients to move in and out of cell Allows a cell to change shape |
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Phospholipids |
Heads-hydrophilic Tails-hydrophobic
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History of plasma membrane model |
Davison Danielli model
Falsification leads to singer Nicholson model
Fluid mosaic model- proteins in and on the surface of membrane. All components of membrane are moving fluidly |
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Cholesterol |
Steroid that increases fluidity |
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Integral proteins |
Go through the whole membrane |
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Peripheral proteins |
Go through one side of membrane |
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Passive transport |
Nutrients pass through with no energy required. Ex: diffusion, osmosis |
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Simple diffusion |
From high to low concentration. Down the concentration gradient. |
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Tonicity |
Hypertonic, hypotonic, and isotonic. Animals prefer isotonic while plants prefer hypertonic |
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Active transport |
Requires energy. Nutrients go through pumps that have specific shape |
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Exocytosis |
Transport vesicles migrate to the plasma membrane, fuse with it, and release their contents |
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Endocytosis |
Cell takes in macromolecules by forming new vesicles from the plasma membrane |
