Which of the following is not a characteristic of enzymes? Each is used to break down substances.
Each has a specific substrate.
Each has an optimal temperature and pH.
O
Each has an active site.

Each is used to break down substances.

Explanation:

Enzymes merely speed up a chemical reaction, not necessarily break down substances.

but there is no

i guess you forgot putting it.

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.