Mrs. Judy Green:Homeostasis and Transport, Enzymes
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judygreen5 on November 14, 2011
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14 terms
Terms | Definitions |
|---|---|
 Homeostasis | keeping a balance between internal and external environments. Example: your body shivers to keep warm, but also perspires (sweats) to keep cool, maintaining a balanced body temperature. |
| Diffusion | the movement of molecules from high to low concentration (molecules spread out for space). |
| Osmosis | the movement of water molecules from high to low concentration. |
| Water Movement | Water will move towards the highest concentration of salt, because it is moving from high water to low water concentration (and low water is where there is high salt!) |
| When do cells swell? | Cells will swell if they gain water, and shrink if they lose water! |
| Active transport | when energy from ATP is used to move molecules from low concentration to high! Basically, the molecules are forced to move to a more crowded space with ATP! |
| Difference in concentration | determines how fast and how much water or salt will move. |
| pH Scale | (HIGH ACIDIC) 1 ------------- (NEUTRAL) 7 ------------ (HIGH BASE) 14 Enzymes |
| Enzymes | speed up chemical reactions (sometimes stated as "altering" or "increasing" the rate) |
| How do enzymes work? | Different enzymes work at a different optimal (best) temperature or pH. |
| What happens to enzymes during high temperatures? | Enzymes can be denatured (change shape) because of high temperatures or low pH (acid) |
| What is attached to the enzyme? | The substrate attaches to the enzyme, where it is converted into the product(s) |
| How have scientists described enzymes? Why? | Scientists have described enzymes as a lock and key because they are specific to only one type of reaction and they are re-useable without having to be made new each time. |
| Enzymes | Can be denatured (change shape) because of high temperatures or low pH (acid) |
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