What is true of a substrate? a. it is not consumed or change by a reaction b. it provides a reaction with energy c. it acts as a product in a chemical reaction d. it acts as a reactant in a chemical reaction

D. It acts as a reactant in a chemical reaction

Explanation:

In biochemistry optics, a substrate is a molecule on which an enzyme acts. In other words, it is up to the enzymes to catalyze chemical reactions involving a substrate. The union between enzyme and substrate forms a complex. In other words, substrate is a substance that will be used by the enzyme to generate another substance, similar to the conductor in a chemical reaction. Therefore we can state that the substrate acts as a reagent in a chemical reaction.

you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.

i think the answer is b.