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17 Cards in this Set
- Front
- Back
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activation energy |
The energy required to start a chemical reaction. |
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catalysts |
substances that speed up chemical reactions and remain unchanged by the reaction they facilitate |
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competitive inhibitor |
A molecule which competes with the substrate for binding to the enzyme active site there by inhibiting the enzyme's activity. |
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induced fit |
A model of enzyme action indicating that the enzyme's active site confromation changes slightly to better accommodate a specific substrate. |
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noncompetitive inhibitor |
A molecule which inhibits the enzyme action by binding at a site other than the active binding site of the enzyme. |
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Specificity |
A characteristic exhibited by enzymes where they are highly specific in recognizing only one particular kind of substrate. |
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substrate |
A reactant in an enzymatic reaction |
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Identify the components for each letter in this diagram. |
A. Enzyme-substrate Complex B. Products C. Enzyme D. Enzyme-product Complex E. Substrate |
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How does an enzyme influence activation energy for a chemical reaction? |
The enzyme lowers activation energy for a chemical reaction. |
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What is the relationship between temperature and enzyme activity? |
All enzymes have an optimum temperature for function. This is because enzymes are proteins and temperature impacts how a protein folds and the enzyme's shape is important to its function. |
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What impact does pH have on activity of an enzyme? |
Each enzyme has an optimum pH range where it is active and can complete its function. The reason for this is because enzymes are proteins and pH impacts how a protein folds. |
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What is the relationship between enzyme activity and covalent modification? |
Enzymes can be activated or "turned on" by addition or removal of a phosphate group, lipid or carbohydrate. |
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What type of inhibition is shown in the following image? |
Competitive |
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What type of inhibition is depicted in the following image? |
Noncompetitive |
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What would happen to the amount of each molecule in this pathway if enzyme 2 was defective? |
The amount of molecules C and D would decrease. The amount of molecule B would increase and the amount of molecule A would stay the same. |
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If molecule D acts as a feedback inhibitor for enzyme 2 in this pathway, what happens to the amount of molecule B following initiation of feedback inhibition? |
The amount of molecule B would increase because it is not being used by enzyme 2. |
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Identify the substrate and products for the first two reactions in this pathway. |
Molecule A is the substrate of Enzyme 1. Molecule B is the product of Enzyme 1. Molecule B is the substrate of Enzyme 2. Molecule C is the product of Enzyme 2. |
