Enzymes are not reactants and are not used up during the reaction. Once an enzyme binds to a substrate and catalyzes the reaction, the enzyme is released, unchanged, and can be used for another reaction. This means that for each reaction, there does not need to be a 1:1 ratio between enzyme and substrate molecules.Answer:
A testable question is B. If a plant is turned upside down, which way will the roots grow? The other options are incorrect because you cannot create some kind of experiment to prove them right or wrong. Hope that helped you.
