In the second step of the proposed mechanism for enolase catalysis, glutamic acid in position 211 acts as a(n) and a proton to the intermediate molecule, resulting in the formation of phosphoenolpyruvate.

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hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?

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