6. Define: Energy of activation (EA) and tell how enzymes change it.

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**6. Define: Energy of activation (Eₐ) and tell how enzymes change it.**

**7. Identify a, b, c, d, and e for the Reactions:**  
   A + B → C + D   OR   C + D → A + B

### Explanation of the Graph

- **Vertical Axis (Y-Axis):** Represents Free Energy.
- **Horizontal Axis (X-Axis):** Represents Progress of the Reaction.

- **A + B:** Represents the reactants at the start of the reaction.
- **C + D:** Represents the products at the end of the reaction.

- **Curve Description:**  
  - The curve initially rises, indicating the input of energy required to reach the transition state.
  - It then falls as the reaction progresses to form products, indicating a release of energy.

- **Labels on the Graph:**
  - **a:** Represents the activation energy (Eₐ) for the forward reaction (A + B → C + D).
  - **b:** Represents the activation energy for the reverse reaction (C + D → A + B).
  - **c:** Represents the energy difference between the reactants and the peak of the curve.
  - **d:** Represents the energy difference between the products and the peak of the curve.
  - **e:** Represents the overall change in energy between the reactants and products.

### How Enzymes Change Activation Energy

Enzymes lower the activation energy (Eₐ) required for a reaction to occur, allowing the reaction to proceed more quickly and at lower energy expenditures. This is visually represented as a lower peak on the energy graph when enzymes are present, enhancing the reaction rate by providing an alternative reaction pathway.
Transcribed Image Text:**6. Define: Energy of activation (Eₐ) and tell how enzymes change it.** **7. Identify a, b, c, d, and e for the Reactions:** A + B → C + D OR C + D → A + B ### Explanation of the Graph - **Vertical Axis (Y-Axis):** Represents Free Energy. - **Horizontal Axis (X-Axis):** Represents Progress of the Reaction. - **A + B:** Represents the reactants at the start of the reaction. - **C + D:** Represents the products at the end of the reaction. - **Curve Description:** - The curve initially rises, indicating the input of energy required to reach the transition state. - It then falls as the reaction progresses to form products, indicating a release of energy. - **Labels on the Graph:** - **a:** Represents the activation energy (Eₐ) for the forward reaction (A + B → C + D). - **b:** Represents the activation energy for the reverse reaction (C + D → A + B). - **c:** Represents the energy difference between the reactants and the peak of the curve. - **d:** Represents the energy difference between the products and the peak of the curve. - **e:** Represents the overall change in energy between the reactants and products. ### How Enzymes Change Activation Energy Enzymes lower the activation energy (Eₐ) required for a reaction to occur, allowing the reaction to proceed more quickly and at lower energy expenditures. This is visually represented as a lower peak on the energy graph when enzymes are present, enhancing the reaction rate by providing an alternative reaction pathway.
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Enzymology is a field of biochemistry that seeks to understand how enzymes operate by examining the link between structural and functional as well as how they fold into their natural form.

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