Analyzing Enzyme Reaction Graphs

Explain how enzymes alter the energy profile of both exothermic and endothermic reactions, and why this is significant for biological processes.

(a)  

• Enzymes increase the activation energy, making rea
• Enzymes decrease the activation energy, allowing reactions to occur more readily.

• Enzymes have no effect on the energy profile of reactions.

• Enzymes change the overall energy change of the reaction.

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NGSS.HS-PS1-4

Given a graph of an exothermic reaction, how would the presence of an enzyme be reflected in the graph, and what does this imply about the reaction rate?

(1) -

(2) -

(3) -

• The graph would show a higher peak, indicating a s
• The graph would show a lower peak, indicating a fa
• The graph would remain unchanged, indicating no ef
• The graph would show a higher final energy level o

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

Analyze the effect of an enzyme on the energy profile of an endothermic reaction and explain how this affects the reaction's feasibility in a biological system.

• Enzymes increase the energy of the reactants, making the reaction less feasible.

• Enzymes decrease the activation energy, making the reaction more feasible.

• Enzymes increase the energy of the products, making the reaction more feasible.

• Enzymes have no effect on the reaction's feasibility.

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DOK Level 3: Strategic Thinking

Consider a scenario where an enzyme-catalyzed reaction is exothermic. How would increasing the temperature affect the reaction rate, and why?

(a)  

• The rate would decrease because the enzyme becomes denatured.

• The rate would increase because the enzyme activit
• The rate would remain unchanged because temperature has no effect.

• The reaction would become endothermic.

Tags

NGSS.HS-PS1-5

In a graph of an enzyme-catalyzed endothermic reaction, what would indicate that the enzyme is functioning optimally, and why is this important?

• A higher energy level of products, indicating more energy is absorbed.

• A lower activation energy peak, indicating the reaction is more efficient.

• A higher activation energy peak, indicating the enzyme is not functioning.

• A lower energy level of reactants, indicating less energy is required.

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DOK Level 3: Strategic Thinking

How can the effect of an enzyme on a reaction be quantitatively measured, and what does this measurement indicate about enzyme efficiency?

• By measuring the change in temperature, indicating heat absorption.

• By measuring the change in pH, indicating acidity changes.

• By measuring the rate of reaction, indicating enzyme efficiency.

• By measuring the color change, indicating product formation.

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DOK Level 3: Strategic Thinking

What is the role of the active site in an enzyme-catalyzed reaction, and how does it contribute to the specificity of enzyme action?

(a)  

• It provides energy to the reaction, making it faster.

• It binds to the substrate and lowers activation en
• It releases products from the enzyme, completing the reaction.

• It changes the enzyme's shape, altering its function.

Why might an enzyme not function properly in an exothermic reaction, and what are the potential consequences for cellular processes?

• The temperature is too low, reducing enzyme activity.

• The pH is not optimal, altering enzyme structure.

• The enzyme is denatured, losing its functional shape.

• The reaction is too fast, overwhelming the enzyme.

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DOK Level 3: Strategic Thinking

In a graph of an enzyme-catalyzed reaction, how can you determine if the reaction is exothermic or endothermic, and why is this distinction important?

• By the height of the activation energy peak, indicating reaction speed.

• By the difference in energy between reactants and products, indicating energy release or absorption.

• By the presence of an enzyme, indicating catalysis.

• By the rate of the reaction, indicating efficiency.

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DOK Level 3: Strategic Thinking

How would you expect the graph of an enzyme-catalyzed reaction to differ from a non-catalyzed reaction in terms of activation energy, and what does this imply about the enzyme's role?

(1) -

(2) -

(3) -

• The enzyme-catalyzed reaction would have a higher
• The enzyme-catalyzed reaction would have a lower a
• Both would have the same activation energy, indica
• The enzyme-catalyzed reaction would have no activa

Tags

NGSS.HS-PS1-4