Term
What is the function of each of the cell membrane's phospholipids bilayer |
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Definition
| A double layer of Phospholipid molecules where hydrophilic "heads" face outward, and whose hydrophobic "Tails" point inward, toward eachother. |
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Term
| What is the function of each of the cell membrane's cholesterol |
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Definition
| Cholesterol acts as a patching substance, which helps the cell maintain an optimal level of fluidity. |
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Term
| What is the function of each of the cell membrane's Proteins? |
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Definition
| Shoot throught the membrane and lie on either side of it serving as support structures, signaling antennas, identification markers, and cellular passageways. Some are integral (bound to membrane) and other are peripheral (not bound to membrane). |
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Term
| What is the function of each of the cell membrane's Glycocalyx? |
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Definition
| Carbohydrate chains that form a lyer on the outside of the membrane, functioning in cell lubrication, adhesion, and signaling. |
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Term
| What's the difference between Integral Proteins, and Peripheral Proteins? |
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Definition
| Integral Proteins are bound to the cell's membrane while peripheral proteins aren't bound to the cell membrane (may be attached to an integral protein though) |
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Term
| What are the "Icebergs" in the fluid mosaic model? |
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Definition
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Term
Diffusion vs. Osmosis
What's the difference? |
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Definition
Diffusion is the movement of molecules from areas of high concentratration to areas of low concentration
Osmosis is the diffusion of molecules though a semipermiable membrane from a place of higher concen |
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Term
| What constitutes hydrophilic tunnels in the membrane? |
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Definition
| microtunnels that provide a hydrophilic opening through a hydrophobic environment - these protein channels are actively involvedi n moving materials through the membrane |
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Term
| During osmosis when a cell is placed into a hypotonic solution, plant cells can build up turgor while animal cells can burst. True or False? Explain. |
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Definition
| True - Plants build up turgor and animal cells can burst when placed in a hypotonic solution because the difference in solute concentration inhibits the water (and its solute's) ability to move. If the solution outside of the cell is of a lower concentration than it's internal system then the plant becomes over inflated with water. |
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Term
| Cells held for a perod of time without significant water loss must have been stored in an isotonic solution? True or False? |
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Definition
| False - it must have been either in an animal cell isotonic solution or a plant cell in either a hypertonic solution or an isotonic solution. |
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Term
| Active transport requires the input of __________ in the form of ___________. |
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Definition
| Active transport requires the input of energy in the form of ATP. |
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Term
| The cell membrane is incapable of capturing larger molecules outside of the cell membrane. True or False? |
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Definition
| False - How else would it get energy in the form of glucose? |
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Term
| The endosymbiont hypothesis has been suggested for the presence of the mitochondria in animals and plants, and chloroplast inside cells of plants. True or False? Explain. |
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Definition
True - Evidence as follows
double membrane
separate dna
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