800 705 kJ 600 497 kJ PE (kJ) 400 200 175 kJ 100 Reaction Progress Created by E. Lee for Virtual Virginia (2021) The reaction coordinate diagram above has an activated complex (AC) with a potential energy (PE) of 705 kJ. Imagine that a catalyst is added, bringing the AC PE down to 586 kJ. What will be the new activation energy, in kJ?

A true transition state can bind to an enzyme active site with a KT as low as 7.00×10-26 M. This is a remarkable number, with interesting consequences. Consider a hypothetical solution of an enzyme in equilibrium with a ligand that binds with a Kp of 3.45×10-27 M. a If the concentration of free enzyme, [E], is equal to the concentration of the enzyme-ligand complex, [EL], what would [L], the concentration of free ligand, be? [L] = M

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In k -7.5 -8.0 -8.5 -9.0 3.10 3.15 3.20 3.25 3.30 3.35 1/Tx 10³ (K-¹) 88.9 kJ/mol 3.32 x 104 kJ/mol There is insufficient information to determine the activation energy 8.31 kJ/mol 130 kJ/mol