Problem 63
Question
What effect does an enzyme have on the activation energy of a biochemical reaction?
Step-by-Step Solution
Verified Answer
Question: Explain the role of an enzyme in a biochemical reaction and its effect on the activation energy. Provide an example to support your explanation.
Answer: An enzyme is a biological catalyst that speeds up biochemical reactions by lowering the activation energy required for the reaction to occur. Enzymes work by binding to substrate molecules and providing a highly specific active site where substrates can form a temporary enzyme-substrate complex. This complex brings the substrates closer together and properly orients them to react, thus reducing the activation energy. As a result, more reactants possess the necessary energy to participate in the reaction, leading to an increased reaction rate. For example, in a reaction where substrate A is converted to product P, the activation energy without an enzyme might be E1. However, with the enzyme present, the activation energy is reduced to E2 (where E2
1Step 1: 1. Unveil the Basic Concepts
It's crucial to first clarify what the key terms mean in this scenario. Activation energy refers to the minimum energy needed for a biochemical reaction to occur. Enzymes are biological catalysts that speed up biochemical reactions by reducing the activation energy required.
2Step 2: 2. Discuss the Role of Enzymes
Enzymes function by binding to the substrate molecules and providing a highly specific active site, where the substrates can come together to form a temporary complex called the enzyme-substrate complex. In this complex, the substrates are brought together in close proximity with the correct orientation to react, thus lowering the activation energy.
3Step 3: 3. Analyze the Impact on Activation Energy
Since enzymes provide an alternate reaction pathway with a lower activation energy, the overall energy requirement for the reaction is reduced. This enables a larger number of reactants to possess the necessary energy to participate in the reaction, and consequently, the reaction rate increases.
4Step 4: 4. Present an Example
To further understand the concept, let's consider an example: In a biochemical reaction involving the conversion of substrate A to product P, without an enzyme, the activation energy required might be E1. However, with the enzyme present, the activation energy is reduced to E2 (where E2
5Step 5: 5. Wrapping Up
In conclusion, an enzyme plays a crucial role in biochemical reactions by lowering the activation energy, effectively increasing the reaction rate. This function is made possible through the formation of an enzyme-substrate complex, which provides a more favorable environment and a specific active site for the substrates to interact and form the product.
Other exercises in this chapter
Problem 61
Enzymes are large proteins. a. What is the function of enzymes? b. Are all proteins enzymes?
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Why is \(\mathrm{Cd}^{2+}\) more likely than \(\mathrm{Cr}^{2+}\) to replace \(\mathrm{Zn}^{2+}\) in an enzyme like carbonic anhydrase?
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Why might reductases also be described as reducing agents?
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When a transition metal ion such as \(\mathrm{Cu}^{2+}\) is incorporated into a metalloenzyme, is the formation constant likely to be much greater than one \((K
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