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:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.