2. ATP hydrolysis is coupled to chemical reactions that are otherwise thermodyna
ID: 198470 • Letter: 2
Question
2. ATP hydrolysis is coupled to chemical reactions that are otherwise thermodynamically unfavorable. A. In the figure below, circle the appropriate terms for each graph (endergonic/exergonic, negative/positive G). B. Label the energy axis and the reaction axis. C. Label the energy of activation on each graph. Endergonic or Exergo G is negative or positive G is negative or positive AE readhen renchan D. Why is the energy of activation for a reaction important in biology? Hint: (Explain what would happen to the gasoline in our fuel tanks if there was no energy of activa- tion barrier:) E. Which of these two graphs above represents the reaction in question 1C? F. Which of these two graphs above represents the reaction in question ID? (requires or releases) 3. A. The endergonic reaction shown above energy to create products from the reactants. How do you know? (requires or releases) B. The exergonic reaction shown above energy to create products from the reactants. How do you know?Explanation / Answer
D. Activation energy is important in biological reactions because most of the reactant require a significant activation energy to undergo a chemical change. However, enzymes in biological systems reduce the activation energy required for the reaction and make the reaction feasible at the cellular conditions.
It is the minimum amount of energy required for a reactant to enter a reaction. If the activation energy is not provided, the reactant remains unreactive (Reaction does not occur).
The first graph represents an endergonic reaction.
Ex: Phosphorylation of glucose
The second graph represents an exergonic reaction.
Ex: ATP hydrolysis
3. The endergonic reaction requires energy. This is because products of an endergonic reaction contain more energy than the reactants. The difference in energy between the reactants and products is absorbed during the reaction.
4. The exergonic reaction releases energy. This is because products of an endergonic reaction contain less energy than the reactants. The difference in energy between the products and reactants is released during the reaction.
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