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8. Which of the following statements about enzymes is FALSE?
- A. Substrates fit onto the enzyme at the active site
- B. No permanent change in the enzyme occurs when it combines with the substrate
- C. Once the enzyme has combined with the substrate, the enzyme cannot be used again
- D. Enzymes decrease the amount of heat needed by a cell for a chemical reaction to occur
9. Which of the following statements about enzymes is FALSE?
- A. Enzymes speed up a chemical reaction
- B. The active site on the enzyme may undergo a slight change in shape when the substrate binds
- C. Enzymes are very specific in their action
- D. The presence of an enzyme will change the outcome of a reaction
In the original “lock and key” model the enzyme was able to be bound to a substrate that was suitable, “lock” and “key” and “key” respectively. According to the model of induced coupling, the enzyme that comes into interaction with substrate may alter its binding to the substrate. This means that an enzyme is able to bind numerous kinds of substrates. After the substrate has been fixed and secured the catalytic process begins.
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