Enzymes

Open Ended

How do you think enzymes, as organic catalysts, impact biological processes in living organisms?

Multiple Choice

Why are catalysts important in chemical reactions?

• They slow down reactions

• They speed up reactions without being consumed

• They are always consumed in reactions

• They change the products of reactions

Multiple Choice

The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?

• Red, because the activation energy is larger
• Blue, because the activation energy is lower
• both reaction progress at the same rate

Labelling

Label the graph showing which line represents the activation energy with or without an enzyme.

Drag labels to their correct position on the image

Activation energy WITH enzyme

activation energy WITHOUT enzyme

Energy stored in reactant

Energy stored in product

Drag and Drop

A chemical reaction can be sped up when our bodies use a substance called a(n) ​

Placeholder

. These help lower the ​

Placeholder

needed to start the ​

Placeholder

.

Drag these tiles and drop them in the correct blank above

enzyme

activation energy

reaction

Multiple Choice

Which of the following best describes how enzymes speed up chemical reactions?

• They increase the activation energy required for the reaction.

• They lower the activation energy required for the reaction.

• They provide energy to the reactants.

• They change the products of the reaction.

Open Ended

Explain the 'lock and key' model of enzyme action and why specificity is important for enzyme function.

Multiple Choice

Which of the following factors can affect enzyme activity?

• pH

• Temperature

• Concentration of enzymes and substrates

• All of the above

Hotspot

Click the part of the picture that is the SUBSTRATE.

Hotspot

Which enzyme's OPTIMAL pH is approximately 9?

Match

Match the following

• pH of the Stomach

• pH of Blood

• pH of 10

Acidic

Neutral

Basic

• Acidic

• Neutral

• Basic

Multiple Select

Select all statements that are true about enzyme activity and temperature.

• All enzymes work best at the same temperature.

• Enzyme activity increases with temperature up to an optimal point.

• After the optimal temperature, enzyme activity decreases rapidly.

• Optimal temperature for human enzymes is around 37°C.

Open Ended

What happens to an enzyme if the temperature or pH goes beyond its optimal range?

Multiple Choice

What happens to an enzyme if the temperature or pH increases beyond its optimal range?

• It becomes more active

• It denatures and loses its ability to bind the substrate

• It changes into a different molecule

• It produces more substrate

Open Ended

Explain how heat affects the structure of a protein, using the concept of denaturation.

Multiple Choice

Which of the following statements about enzyme concentration and reaction rate are correct?

• Increasing enzyme concentration always increases reaction rate indefinitely

• Reaction rate increases with enzyme concentration to a certain point, then levels off

• Reaction rate decreases as enzyme concentration increases

• Reaction rate is unaffected by enzyme concentration

Open Ended

Reflecting on today's lesson about enzymes and catalysts, what is one question you still have or one concept you would like to explore further?