1. The concentration of an enzyme within a cell is extremely low realtive to oth

Question

1. The concentration of an enzyme within a cell is extremely low realtive to other material present, yet functions effectively in its metabolic rate. How can enzyme function and never seem to run out?

2. A chemist found that a reaction did not take place under any set of conditions. If the chemists added a catalyst, would the reaction then occur? Explain your answer?

3. For a given enzyme-catalyzed reaction, on a molar basis, substrate concentration increases from two to four times the enzyme concentration (double). Would the rate of the reaction also double? Explain your answer?

Explanation / Answer

Enzymes are biocatalyst. Recall that catalyst increases the rate of the reaction without being consumed. This means the same catalyst can be used ver and over again in several cycles of reaction. If catalyst is added the reaction may occur. This is because the catalyst forms an intermediate with substrate resulting in the overall decrease in the activation energy of the reaction. Therefore the reaction which was not taking place in absence of catalyst may occur in presence of catalyst. No rate of reaction does not increase. This is because each catalyst molecule can increase the rate of reaction by a fixed/ specific factor depending on how much lowering (fixed for particular set of catalyst and substrate at a given temperature and pressure) in activation energy has taken place. Thus increasing the concentration of the catalyst will not increase the rate of reaction

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