Which of the following does these actions? "Creates a physical barrier: Regulates the flow of materials into and out of the cell. Recognizes
chemical signals; Creates structure" *
A. vacuoles
B. prokaryotic Cells
C. cell membrane

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme