How could i compare an amusement park to a cell? think of the parts of the cell. (nucleus, mitochondria, etc.) nucleus would most though.

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.