Reaction Intermediates

What is the primary reactant that undergoes a series of reactions to produce pyruvate in glycolysis?

• Pyruvate

• Glucose

• ATP

• Mitochondria

A complex chemical reaction proceeds through several individual steps. What are these individual steps collectively known as?

• Overall reactions

• Reaction mechanisms

• Catalytic cycles

• Equilibrium states

Which statement accurately describes a reaction intermediate in a multi-step chemical process?

• It is a reactant consumed in the first step and regenerated in the last step.

• It is a species formed in one elementary step and consumed in a subsequent elementary step.

• It is a final product that appears in the overall reaction.

• It is a catalyst that speeds up the reaction without being consumed.

Consider the following elementary steps for a reaction:Step 1: NO2 + NO2 → NO3 + NO; Step 2: NO3 + CO → NO2 + CO2. Which species acts as a reaction intermediate in this mechanism?

• NO2

• CO

• NO3

• CO2