Enzymes

What is the main function of enzymes in biochemical reactions?

• Act as catalysts
• Store energy
• Produce ATP
• Break down proteins

Do enzymes undergo any permanent changes during a reaction?

• No, they remain unchanged
• Yes, they are consumed
• Yes, they convert into another enzyme
• No, they break down into amino acids

What is the term for the small area on the surface of an enzyme where a specific substrate can bind?

• Active site
• Binding site
• Catalyst site
• Substrate site

What model describes the specific binding of an enzyme and substrate as a lock and key?

• Lock and key model
• Induced fit model
• Substrate specificity model
• Enzymatic model

What is a non-protein chemical compound or metallic ion that assists in an enzyme's activity called?

• Cofactor
• Substrate
• Coenzyme
• Active site

What are the two types of cofactors?

• Inorganic cofactor and organic cofactor
• Coenzyme and substrate
• Active site and inhibitor
• Enzyme and product

Which vitamin B complex member is the precursor for the coenzyme NAD?

• Nicotinic acid
• Ascorbic acid
• Thiamine
• Riboflavin

What is the term for the enzyme-substrate complex that is formed during a reaction?

• Enzyme-substrate complex
• Catalytic complex
• Active complex
• Product complex

What is the suffix commonly found in the names of many enzymes?

• -ase
• -ose
• -ine
• -ite

Which vitamin is important for making a chemical in the retina and protecting the surface of the eye?

• Vitamin A
• Vitamin B1
• Vitamin B2
• Vitamin C