Morgan - Biology Quiz

Enzymes are also called biological catalysts. What does a catalyst do?

• Slow down chemical reactions.

• Make more chemical reactions happen.

• Speed up chemical reactions

• Slow down chemical reactions

What does the lock and key model show?

• Each enzyme has a specific substrate that can bind to its active site.

• Each enzyme has a few different substances that can bind to their active site.

• Once the enzyme has been used, it can't be used again.

• Enzymes can denature under different environmental conditions.

Use the graph to answer question 4. Which curve shows the progress of reaction with an enzyme?

• 1, because the activation energy is higher

• 2, because the activation energy is lower

• 1, because the activation energy is lower.

• 2, because the activation energy is higher

Use the graph to answer the question. Based on he graph above, what is the optimum temperature for this enzyme?

• 60

• 10

• 30

• 40

When the temperature was increased above the optimum point, what happened to the rate of enzyme action?

• The rate of enzyme action increased continually as temperature increased.

• The rate of enzyme action decreased once the temperature passed the optimum point.

• The rate of enzyme action stayed constant as the temperature changed.

• The rate of enzyme action as the temperature decreased.

Catalase is an enzyme produced in the liver of animals, which breaks down hydrogen peroxide. Hydrogen peroxide is produced by many reactions in your cells but is toxic and needs to be destroyed so it doesn't damage your body. Oxygen gas and water are created. These molecules are not harmful for your body. Which molecules are the substrate, and which are the product?

• Substrate=catalase, Product=oxygen and water

• Substrate=hydrogen peroxide
  Product=oxygen gas and water

• Substrate = catalase

  Product = hydrogen peroxide

• Substrate = oxygen gas and water

  Product = hydrogen peroxide

People who are lactose intolerant cannot consume dairy products because they are missing an enzyme that breaks down the sugar in dairy products, called lactose. Which of the following enzymes is not present in these individuals?

• Catalase

• Nuclease

• Lactase

• Amylase