TEAS Reaction Rates & Conditions Practice Questions

5 free Reaction Rates & Conditions practice questions

Pick an answer and check it to see the full step-by-step explanation.

1. Question 1
   A nurse reviews a lab note stating: “An enzyme was added to speed up the conversion of substrate S to product P.” Which statement best describes what the enzyme changes versus what it does NOT change?

   It increases activation energy so fewer molecules reach the transition state, preventing side reactions.It makes the reaction more exergonic by making 94G more negative, which increases the reaction rate.It lowers the activation energy and increases the reaction rate without changing the reaction’s overall 94G.It shifts the equilibrium position toward products, increasing the final amount of P formed.

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2. Question 2
   A patient has a suspected genetic enzyme deficiency. The nurse explains that adding a functional enzyme to the affected reaction would most directly affect which aspect of the reaction?

   It changes the reaction’s overall $\Delta G$ so the products become more stable than the reactants.It allows the reaction to reach equilibrium faster without changing the equilibrium position.It permanently shifts the equilibrium toward products so more product is present at equilibrium.It increases the energy required to initiate the reaction, slowing the rate.

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3. Question 3
   A patient’s serum enzyme shows maximal activity at pH 7.4. In a lab assay, the sample is accidentally run at pH 2.0. Which outcome is most likely regarding the enzyme-catalyzed reaction?

   The reaction rate will decrease because the enzyme’s active site may be altered by the extreme pH.The reaction rate will increase because lower pH always increases enzyme activity.The equilibrium position will permanently shift to favor products at pH 2.0.The overall ΔG of the reaction will become more negative due to the acidic environment.

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4. Question 4
   A medication is found to act as a competitive inhibitor of an intestinal digestive enzyme. In a lab assay, the inhibitor is kept constant while the substrate concentration is gradually increased. Which result is most consistent with competitive inhibition?

   The reaction rate increases at high substrate concentrations because substrate can outcompete the inhibitor for the active site.The reaction rate remains unchanged because inhibitors do not affect enzyme-catalyzed reactions.The reaction rate decreases and cannot be restored by increasing substrate concentration because the inhibitor permanently denatures the enzyme.The reaction’s overall ΔG becomes more negative, making the reaction more spontaneous.

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5. Question 5
   A student compares the uncatalyzed and enzyme-catalyzed versions of the same reaction and notes that the enzyme provides an alternative pathway. Which statement best describes what remains unchanged when an enzyme catalyzes this reaction?

   The equilibrium constant (Keq) increases, shifting the reaction toward products.The products contain less potential energy than before, making the reaction more exergonic.The reaction’s overall free energy change (ΔG) is unchanged, even though the reaction rate increases.The activation energy barrier (Ea) is unchanged, but the reaction rate increases.

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