Question

enzymes are
able to work at any ph.
consumed (used up) during a chemical reaction.
reusable.
inorganic molecules.
non - specific with regard to substrates.

Explanation:

Enzymes are biological catalysts. They have an optimal pH range for activity, are not consumed in reactions, are organic (usually proteins or RNA), and are highly specific to their substrates. Since they are not used up in reactions, they are reusable.

Answer:

reusable.