Ch. 2.4 Chemical Reactions & Enzymes

Most enzymes are which of the following macromolecules?

• Carbohydrates

• Lipids

• Proteins

• Nucleic acids

True or false, enzymes are catalysts found in living things.

• True

• False

What is the function of a catalyst?

• To increase the rate of chemical reactions

• To decrease the rate of chemical reactions

• To maintain the rate of chemical reactions

• To introduce more cats into the chemical reaction

True, or false, enzymes are permanently altered during chemical reactions.

• True

• False

Which of the following statements is correct?

• Enzymes are specific in regards to the substrates with which they can bond.

• Enzymes are not specific in regards to the substrates with which they can bond.

Which of the following is an enzyme?

• Sucrose

• Lactose

• Lactase

• Maltose

How do enzymes lower the activation energy necessary to begin a chemical reaction?

• By strengthening bonds between atoms or molecules of the substrate

• By weakening bonds between atoms or molecules of the substrate

• By having no effect on the bonds between atoms or molecules of the substrate

Without an enzyme present, a chemical reaction will require ____ energy to be activated.

• More

• Less

• The same amount of

The ____ is the enzyme and substrate once they are joined.

• Enzyme

• Active site

• Substrate

• Enzyme-substrate complex

The ____ is what temporarily binds to the enzyme and is the reactant in the chemical reaction.

• Enzyme

• Active site

• Substrate

• Enzyme-substrate complex