1st year bio.ch enzymes

What is the primary component of an enzyme's active site that binds the substrate?

• Amino acid residues
• Fatty acids
• Carbohydrate chains
• Nucleic acids

What type of cofactor is a small organic molecule that helps in enzyme activity?

• Inorganic cofactor
• Coenzyme
• Metal ion
• Prosthetic group

Which of the following is an example of an inorganic cofactor for enzymes?

• NADH
• Mg²⁺
• FADH₂
• Coenzyme A

Which part of the enzyme’s active site is responsible for stabilizing the transition state?

• Substrate binding site
• Catalytic site
• Allosteric site
• Regulatory site

What is the role of cofactors in enzyme function?

• Provide structural support
• Increase enzyme concentration
• Assist in enzyme catalysis
• Stabilize the enzyme structure

What is the first step in the mechanism of enzyme action?

• Substrate binding
• Formation of the transition state
• Product release
• Enzyme denaturation

What happens during the transition state in enzyme catalysis?

• Substrate is completely transformed into product
• Substrate binds to the enzyme at the active site
• The enzyme undergoes conformational change
• Product is released

Which of the following is required to stabilize the transition state of an enzyme reaction?

• Water molecules
• Cofactors or coenzymes
• Substrate concentration
• Temperature

What does the enzyme’s active site specifically interact with in the mechanism of enzyme action?

• The product
• The transition state
• The substrate
• The cofactor

Which mechanism do enzymes primarily use to lower the activation energy of a reaction?

• Increase temperature
• Decrease substrate concentration
• Create a microenvironment that stabilizes the transition state
• Increase pH