Enzymes and Their Functions

What is the role of enzymes in biochemical reactions?

• Enzymes slow down reactions to prevent product accumulation.

• Enzymes speed up reactions to produce products quickly.

• Enzymes eliminate the need for substrates in reactions.

• Enzymes change the chemical nature of reactions.

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What is an enzyme primarily composed of?

• Lipids

• Carbohydrates

• Proteins

• Nucleic acids

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Which type of enzymatic activity is associated with oxidation reactions?

• Transferases

• Hydrolases

• Oxidoreductases

• Ligases

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What is the function of transferases in enzymatic activity?

• They add water to cleave bonds.

• They are involved in oxidation reactions.

• They move functional groups between molecules.

• They bind substrates to enzymes.

Which of the following enzymes helps to join molecules together?

• Lyases

• Isomerases

• Ligases

• Proteases

What is the role of isomerases in biological processes?

• Breaks down proteins

• Alters the shape of a molecule

• Joins molecules together

• Breaks a double bond

Which enzyme is responsible for breaking down the sugars in milk and sucrose?

• Lipases

• Proteases

• Lactase and sucrase

• Isomerases

What is one of the important traits of enzymes?

• They are altered during the course of a reaction

• They change the chemical equilibrium of reactants and products

• They are not altered during the course of a reaction

• They increase the activation energy of a reaction

How does an enzyme lower the activation energy of a reaction?

• By increasing the energy needed to form the transition state

• By reducing the energy needed to form the transition state

• By altering the chemical equilibrium

• By breaking down reactants

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What is the role of the active site in an enzyme?

• It binds to cofactors permanently.

• It provides energy for the reaction.

• It has the correct shape for binding to the substrate.

• It alters the enzyme's overall structure.