Enzymes

What are enzymes?

• Proteins

• Carbohydrates

• Fats

• Phosphates

Enzymes are used up in reactions.

• True

• False

What is the function of an enzyme?

• To metabolise lipids

• To convert glucose to energy

• To catalyse reactions

• To synthesise oxygen for respiration

Which of the following statements about enzymes is NOT true?

• They are substrate specific

• They can break down substrates into smaller molecules

• A single enzyme can bind to multiple different substrates

• They can synthesis substrates into larger molecules

The lock-and-key model of enzyme activity is more accurate than the induced fit model

• True

• False

Enzymes are at their maximum efficiency:

• In a very broad range of optimum conditions

• When they are bound to a substrate

• When they are in large concentrations

• In a very limited range of optimum conditions

At what temperature do most human enzymes work best?

• 36⁰C

• 35⁰C

• 37⁰C

• None of the above

What is denaturation?

• When enzymes melt

• When the bonds in an enzyme break

• When substrates melt

• When the bonds break in a substrate

Which condition would plateau an enzyme's rate of reaction?

• Increasing pH

• Increasing temperature

• Increasing substrate concentration

• All of the above

At what pH would you estimate that pepsin, a stomach enzyme, would work best?

• pH 7

• pH 10

• pH 2

• pH 6