The reaction coordinate diagram shown to the left is for the mitochondrial enzym

Question

The reaction coordinate diagram shown to the left is for the mitochondrial enzyme ATP synthase. Use this diagram to answers Questions 1 - 4 From this diagram you can conclude: (A) ATP synthesis is endergonic. (B) The reaction is at equilibrium. (C) ATP synthesis is exergonic. (D) ATP synthesis is endothermic. (E) ATP synthesis is exothermic. How many intermediates are generated in the enzyme catalyzed pathway? (A) 4 (B) 3 (C) 2 (D) l (E) 0 The rate determining step for ATP synthesis: (A) cannot be determined from a reaction coordinate diagram. (B) is the binding of ATP. (C) is the release of ATP from the enzyme. (D) is the generation of ATP. (E) is the binding of ADP and Pi. The rate determining step for the reverse reaction converting ATP into ADP and Pi is: (A) cannot be determined from a reaction coordinate diagram. (B) the release of ADP and Pi. (C) the binding of ATP. (D) the release of ATP from the enzyme. (E) the generation of ADP and Pi.

Explanation / Answer

1) ATP synthesis is endergonic (a). The hydrolysis of ATP is exergonic and synthesis of ATP is endegonic.

2) There are 3 (b) intermediates are generated in the enzyme catalysed pathway.

3) The rate determining step in the synthesis of ATP is the release of ATP from the enzyme(c) as the process is highly endergonic and should not happen spontaneously.

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