Which statement best describes the mechanism by which enzymes catalyze a reaction? a. enzymes absorb the change in enthalpy (δh), permitting a reaction to proceed. b. enzymes lower the concentration of the substrates, thereby driving the equilibrium to favor product formation. c. enzymes are completely used up in the course of the reaction and therefore favor product formation. d. enzymes lower the energy barrier necessary to achieve the transition state of a reaction. e. enzymes lower the concentration of the products, thereby driving the reaction to favor product formation.

Option E,  Enzymes lower the energy barrier necessary to achieve the transition state of a reaction.

Explanation:

Enzymes  just act like bio catalyst to favor the formation of final product at a given physical and chemical condition. Thus these enzymes reduces the energy required for reaching the transition stage through a process called catalysis.  Enzymes do not modify or change the final products however they enhance the rate of biochemical reaction.

Thus, option E is correct

explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.

cellular respiration oxidizes food into energy in the form of atps.

glycolysis (6 c hexose) > 2x atps are used > 6c hexose biphosphate > 2 x 3c triphosphate >

2 x 3c pyruvate (2x nadh produced from nad) and (4x atp produced)

pyruvate actively pumped mitochondrial matrix.