Match the term or concept with the best definition or description available A protein that serves both to link together a set of interacting proteins and to position them at a specific location in a cell Region of an enzyme surface to which a substrate molecule binds in order to undergo a catalyzed reaction C. Kinase Type of metabolic regulation in which the activity of an enzyme acting near the beginning of a reaction pathway is D. Allosteric protein inhibited by a product of the pathway. E. Feedback inhibition F. A protein (mostly) catalyst that speeds up a reaction, often by a factor of a million or more, without itself being changed or consumed in the reaction Enzyme that transfers the terminal phosphate group of ATP to a specific amino acid in a target protein Rate-limiting structure that forms transiently in the course of a chemical reaction and has the highest free energy of any reaction intermediate Protein that changes its conformation (and often its activity) when it binds a regulatory molecule or when it is covalently modified A. Scaffold protein B. Small molecule that is tightly associated with a protein catalyst, frequently positioned at the active site where it directly participates in the chemical reaction Coenzyme Active site G. Enzyme H. Transition state