A level revision Ch 1-6 2025

what cell specialises into a plasma cell

• T Memory cell
• T killer cell
• Naive B cell
• Naive T cell
• an antibody

Which is not a factor that affects enzyme controlled reactions

• pH
• Temperature
• Humidity
• Enzyme Concentration
• Substrate Concentration

Which is an enzyme that catalyses extracellualr reactions

• Amylase
• Catalase
• Peroxidase
• Glucokinase

Where does an competitive Inhibitor Bind

• Allosteric site
• Active site

What is the primary role of enzymes in chemical reactions?

• Increase the activation energy
• Lower the activation energy
• Change the substrate structure
• Prevent substrate binding

What is the induced fit model of enzyme activity?

• The substrate changes shape to fit the enzyme
• The enzyme’s active site alters to fit the substrate
• The enzyme binds permanently to the substrate
• The substrate breaks down without enzyme interaction

Which of the following is an example of a coenzyme?

• Magnesium ion
• NAD derived from niacin
• Haem group in haemoglobin
• Penicillin

What is the role of a prosthetic group in enzyme function?

• Breaks disulphide bonds in the enzyme
• Temporarily binds to the enzyme to shield charges
• Competes with the substrate for the active site
• Permanently attaches to the enzyme to aid in substrate binding

Which of the following is an example of an irreversible inhibitor?

• A competitive inhibitor binding via hydrogen bonds
• A non-competitive inhibitor binding to the allosteric site
• Cyanide covalently binding to the active site
• Ritonavir inhibiting HIV protease

Which drug is an example of an enzyme inhibitor used to treat bacterial infections?

• Penicillin
• Ritonavir
• Cyanide
• NAD