Chapter 2.4 End of Chapter Assessment
Terms in this set (8)
25. An enzyme speeds up a reaction by
A. Lowering the activation energy.
26. In a chemical reaction, a reactant binds to an enzyme in a region known as the
D. Active site.
27. Describe the two types of energy changes that can occur in a chemical reaction.
Endothermic - the molecules require energy to break bonds; exothermic - the molecules or atoms often form bigger molecules and release energy.
28. What relationship exists between an enzyme and a catalyst?
An enzyme is a biological catalyst. An enzyme is a specific variant of a catalyst.
29. Describe some factors that may influence enzyme activity.
Temperature, pH, and regulatory molecules all affect enzyme activity.
30. Why is it important that energy-releasing reactions take place in living organisms?
So that the released energy can be utilized by the organism.
31. Changing the temperature or pH can change an enzyme's shape. Describe how changing the temperature or pH might affect the function of an enzyme.
Perhaps that given enzyme works optimally in a certain temperature and pH. If the temperature or pH is an unfit environment for the enzyme, it's function could be altered or be carried out less efficiently.
32. Explain why a lock and key are used to describe the way an enzyme works. Describe any ways in which the analogy is not perfect.
For every lock, there is a key that just fits; for every enzyme, there is a substrate that just fits. However, the enzyme actually recognizes the incoming substrate and binds perfectly to the substrate. In other words, the apology only explains how an enzyme works at a basic level.
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