Cell and Molecular Biology
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Enzyme | show 🗑
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| show | The sum total of all the chemical reactions in a cell.
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| Anabolism | show 🗑
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| show | Reactions which involve the breakdown of molecules and usually release energy.
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| show | Each substrate (key) fits exactly into the active site (lock) of the specific enzyme.
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| show | The enzyme's active site is flexible and can change shape slightly to better fit a particular substrate instead of being a rigid shape.
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| show | 1) Enzyme must have physical contact with substrate
2) Enzyme must have an active site which fits the substrate
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| show | Enzymes work best at their optimal pH. This varies based on the particular enzyme. Extremes in pH can denature enzymes.
Changes in pH can affect the hydrogen and ionic bonds of enzyme active sites resulting in changes in shape of the active site.
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| show | 1) Increase in temperature increases kinetic energy of molecules leading to more collisions of enzyme and substrate - rate of reaction is increased
2) As temp increases beyond optimum point enzyme becomes denatured.
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| What is the effect of enzyme concentration on enzyme action? | show 🗑
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| show | 1) If concentration of enzyme is constant and substrate concentration is increased, rate of reaction increases.
2) If substrate concentration exceeds the available active sites, no further increase occurs until the active sites become free again.
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| show | Inhibitor binds to the active site of the enzyme
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| show | Inhibitor binds to the enzyme at a position other than the active site
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| Give three examples of enzyme inhibitors. | show 🗑
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| What are the two main ways in which the rate of enzyme-catalyzed reactions can be measured? | show 🗑
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| What is meant by the denaturation of an enzyme? | show 🗑
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| What are enzyme inhibitors? | show 🗑
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| show | Inhibitors which make temporary attachments to the active site.
Two types: competitive and non-competitive
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| show | Inhibitors which bind permanently and usually destructively to enzymes.
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| show | A substance which speeds up a chemical reaction but remains unchanged itself at the end.
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| show | They are protein molecules made by living cells which speed up chemical reactions but remain unchanged themselves.
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| Define substrate. | show 🗑
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CAPE Biology Unit 1
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