Enzymes

What are enzymes? (You can choose more than one answer)

• They are biological catalysts.

• They speed up chemical reactions.

• They are proteins.

• They all build compounds.

Enzmes can:

• Catalyze more than one substrate.

• Work on one substrate.

• Work on one particular product.

What are the enzymes which work on one substrate called?

• Product.

• Specific.

• Substrate.

Choose the enzyme properties (you can shoose more than one answer):

• Enzymes are proteins.

• Enzymes are specific.

• Enzymes can work on more than one substrate.

• Enzymes are affected by temperature.

• Enzymes are affected by pH.

At which temperatures are enzymes denatured?

• 0

• 20

• 30

• 60

How can you increase an enzyme controlled reaction? (you can choose more than one answer)

• Increasing the substrate concentration.

• Increasing the enzyme concentration.

• Decreasing the enzyme concentration.

Catalase breaks down hydrogen peroxide into:

• water only

• oxygen only

• water and oxygen

• hydrogen

How can we tell that catalase has broken down hydrogen peroxide?

• iodine changes colour

• catalase changes colour

• frothing

• hydrogen peroxide changes colour

At which temperature do enzymes work best (optimum temperature)?

• 0 degrees Celsius

• 20 degrees Celsius

• 40 degrees Celsius

• 100 degrees Celsius

At which temperature are enzymes inactivated?

• 0 degrees Celsius

• 20 degrees Celsius

• 40 degrees Celsius

• 100 degrees Celsius