The activation energy of an enzyme-catalyzed reaction is

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The question asks about how the activation energy of an enzyme-catalyzed reaction compares to that of the uncatalyzed reaction.
Option 1: 'greater than that of the uncatalyzed reaction.' This would imply the enzyme makes the reaction harder to start, which contradicts the fundamental role of enzymes as catalysts that lower energy barriers.
Option 2: 'less than that of the uncatalyzed reaction.' This aligns with enzyme function: an enzyme provides an alternative pathway with a lower activation energy, speeding up the reaction without changing the overall thermodynamics.
Option 3: 'equal to that of the uncatalyzed reaction.' If the activation energies were equal, the enzyme would not be providing any catalytic advantage, which contradicts experimental observations of enzyme catalysis reducing the required energy to reach the transition state.
Option 4: 'of no relation to that of the uncatalyzed reaction.' In reality, there is a defined relationship: enzymes alter the energy landscape and lower the activation energy, so saying there is no relation would be incorrect and scientifically implausible.
Overall, the only statement that matches established enzymology is that the activation energy for an enzyme-catalyzed reaction is reduced relative to the uncatalyzed process, illustrating the catalytic effect of the enzyme.

BIOL 1009 (001-006/050-055) Midterm Exam II

The activation energy of an enzyme-catalyzed reaction is

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