AP Biology Unit 2 & 3 Review

Which of the following statements best helps explain the reaction specificity of an enzyme?

• The free energy of the reactants is greater than the free energy of the products.

• The equilibrium constant of the reaction is much greater than 1.

• The shape and charge of the substrates are compatible with the active site of the enzyme.

• The concentration of the enzyme inside living cells is greater than the concentration of substrate.

A researcher designs an experiment to investigate the effect of environmental temperature on the function of an enzyme. For each trial included in the experiment, the researcher will add the enzyme and its substrate to an aqueous buffer solution and then measure the amount of product formed over 20 minutes. Which of the following must remain the same for all trials of this experiment?

• The initial concentration of the substrate

• The final concentration of the product

• The three-dimensional structure of the enzyme

• The temperature of the aqueous buffer solution

The most likely explanation for the results shown in this graph is that...

• pH affects the shape of the active site of the enzyme

• pH affects the temperature of the reaction

• the enzyme has a quaternary structure

• the enzyme has disulfide bonds

• pH affects the primary structure of the enzyme

Which of the following questions can best be answered by the diagram?

• Does the addition of an enzyme reduce the activation energy required for a reaction?

• Does the addition of an enzyme result in the formation of covalent bonds?

• Does the addition of an enzyme produce a greater amount of products?

• Does the addition of an enzyme change the pathway for the reaction?

Which of the following can be used to determine the rate of enzyme-catalyzed reactions?

• Rate of disappearance of the substrate

• Rate of disappearance of the product

• Change in volume of the solution

• Increase in activation energy

• Rate of disappearance of the enzyme

ATP hydrolysis is a _____ reaction.

• Exergonic

• Endergonic

ADP phosphorylation is an _____ reaction.

• Exergonic

• Endergonic

Exergonic means:

• energy is consumed

• energy is released

Endergonic means:

• energy is consumed

• energy is released

If ADP is phosphorylated then what is this indicating in the reaction? 

• ADP is forming into ATP
• ADP is becoming AMP
• ADP is being used to power other reactions
• ADP is being created by the reaction