Enzymes Quiz

How do enzymes increase the speed of chemical reactions?

• reducing the number of products   
• reducing the activation energy
• increasing the temperature of the cell
• increasing the concentration of reactants 

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NGSS.HS-PS1-5

Which of these is NOT true?

• Enzymes can denature (change shape) when the temperature gets too high.
• Enzymes can only be used once in a chemical reaction. 
• Extreme pH can denature enzymes.
• Enzymes speed up chemical reactions. 

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NGSS.HS-PS1-5

What is the function of an enzyme?

• enzymes break themselves into small pieces
• enzymes slow down chemical reactions
• enzymes speed up chemical reactions
• enzymes combine products to form reactants 

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NGSS.HS-PS1-5

Which macromolecules are enzymes?

• Carbohydrate

• Lipid

• Nucleic Acid

• Protein

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NGSS.HS-LS1-1

What happens to an enzyme when it is denatured?

• It becomes more active

• It loses its shape and function

• It becomes a substrate

• It doubles its activity

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DOK Level 1: Recall

Enzymes are catalysts. What is a catalyst?

• Causes a chemical reaction to occur

• Slows down a chemical reaction

• Speeds up a chemical reaction

• Stops a chemical reaction from occuring

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NGSS.HS-PS1-5

Label the Enzyme

a

b

c

Active Site

Substrate

Enzyme

Which enzyme would you expect to find in bacteria growing in a hot environment?

• Enzyme X

• Enzyme Y

The optimum pH for this enzyme is approximately

• 2

• 3.5

• 5.5

• 8

• 10

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NGSS.HS-PS1-5

How does the Lock and Key Model help us understand how enzymes work?

Answer explanation

The Lock and Key Model illustrates that enzymes have a specific shape that fits a particular substrate, much like a key fits into a lock.

This model emphasizes the specificity of enzymes, meaning that each enzyme only catalyzes a specific reaction involving its corresponding substrate.