Metabolic Pathways and Enzyme Inhibition Quiz

What is an example of an intracellular reaction?

• Breakdown of nutrients within the gut

• Glycolysis

• Chemical digestion

• Venom interaction

What type of metabolic pathway is the Krebs cycle an example of?

• Linear chain

• Extracellular reaction

• Cyclical pathway

• Feedback inhibition

What is the role of enzyme inhibitors?

• Enhance enzyme activity

• Bind to enzymes and disrupt substrate interaction

• Increase metabolic rate

• Convert energy into heat

How can inhibition be categorized based on its mechanism of action?

• Reversible and irreversible

• Competitive and non-competitive

• Intracellular and extracellular

• Linear and cyclical

What is a characteristic of metabolic reactions in terms of energy transfer?

• 100% efficient

• Always result in energy gain

• A proportion of energy is always lost as heat

• Only occur in endotherms

What is the role of a competitive inhibitor in enzyme activity?

• It binds to the allosteric site and changes enzyme shape.

• It blocks the active site, preventing substrate binding.

• It enhances the enzyme's activity.

• It permanently deactivates the enzyme.

Which type of inhibition involves binding to an allosteric site?

• Competitive inhibition

• Non-competitive inhibition

• Feedback inhibition

• Mechanism-based inhibition

What is the effect of feedback inhibition on a metabolic pathway?

• It speeds up the reaction sequence.

• It increases the production rate.

• It halts the reaction sequence and decreases the product formation rate.

• It has no effect on the pathway.

Which molecule is an example of a mechanism-based inhibitor?

• Statins

• Isoleucine

• Penicillin

• Threonine

How do certain strains of bacteria resist penicillin?

• By increasing substrate concentration

• By mutating their transpeptidase gene

• By producing more enzymes

• By binding to the active site