Enzyme Function and Activity Concepts

Dr. Tom Kennedy introduces enzymes, focusing on their role in biology and digestion. He contrasts classical and quantum views of enzyme function, highlighting quantum tunneling's potential impact. The video explores classical biochemistry, enzyme catalysis, and the structure and function of enzymes, including active sites and substrate interactions.

What enzyme is commonly found in saliva and helps in the digestion of food?

• Lipase

• Amylase

• Protease

• Lactase

What is the classical view of how enzymes function?

• They do not affect the energy barrier.

• They lower the activation energy of reactions.

• They increase the energy barrier of reactions.

• They increase the reaction time.

What is quantum tunneling in the context of enzyme activity?

• Enzymes stop reactions from occurring.

• Enzymes increase the energy required for reactions.

• Enzymes allow particles to pass through energy barriers.

• Enzymes create new energy barriers.

How do enzymes speed up chemical reactions according to classical biochemistry?

• By adding more reactants.

• By changing the pH of the environment.

• By lowering the activation energy required.

• By increasing the temperature of the reaction.

How do enzymes differ from other proteins in terms of function?

• They are not affected by temperature changes.

• They are not involved in any reactions.

• They act as catalysts to speed up reactions.

• They slow down chemical reactions.

What is the role of the active site in an enzyme?

• It is where substrates bind and reactions occur.

• It increases the energy of the enzyme.

• It releases energy to the environment.

• It binds to inhibitors permanently.

What is the induced fit model in enzyme activity?

• Enzymes change shape to better fit the substrate.

• Enzymes and substrates do not interact.

• Enzymes remain rigid during reactions.

• Substrates change shape to fit the enzyme.

What is the significance of metal ions in enzyme active sites?

• They decrease the enzyme's activity.

• They increase the enzyme's size.

• They help facilitate chemical reactions.

• They prevent substrates from binding.

What is the role of kinetic energy in enzyme activity?

• It is not involved in enzyme activity.

• It decreases the enzyme's efficiency.

• It increases the enzyme's size.

• It helps substrates bind to the enzyme.

What happens to enzymes after they catalyze a reaction?

• They are used up and cannot be reused.

• They become inactive.

• They are permanently altered.

• They can be used repeatedly for the same reaction.