Quiz on Enzymes

What are enzymes primarily composed of?

• Nucleic acids

• Carbohydrates

• Lipids

• Proteins

Which of the following is an example of a coenzyme?

• NAD

• Zinc ion

• Iron ion

• Calcium ion

What is the term for the region of an enzyme where substrate binding occurs?

• Active site

• Allosteric site

• Binding pocket

• Catalytic center

Which class of enzymes catalyzes the transfer of functional groups?

• Ligases

• Hydrolases

• Transferases

• Lyases

What is the role of co-factors in enzyme activity?

• To act as a substrate

• To provide energy

• To stabilize the enzyme structure

• To assist in substrate binding

Which model describes the specificity of enzyme-substrate interaction as a perfect fit?

• Transition state model

• Substrate binding model

• Lock and key model

• Induced fit model

What is the effect of enzymes on the activation energy of a reaction?

• Have no effect

• Increase it

• Decrease it

• Double it

Which of the following is NOT a characteristic of enzymes?

• They are specific to substrates

• They are biocatalysts

• They are not consumed in reactions

• They are heat stable

What is the term for the maximum rate at which an enzyme can convert substrate to product?

• Turnover number

• Reaction rate

• Catalytic efficiency

• Enzyme activity

Which enzyme classification involves the formation of a covalent bond between two molecules?

• Isomerases

• Ligases

• Lyases

• Hydrolases