Exploring Enzyme Action: Lock and Key vs. Induced Fit

This video tutorial by Miss Estrich covers enzyme action, focusing on their structure and function. It explains the role of enzymes in catalyzing reactions by lowering activation energy. The video details two models of enzyme action: the lock and key model and the induced fit model, highlighting their differences and the accepted induced fit model. The tutorial is aimed at A-level biology students, building on GCSE knowledge.

What type of proteins are enzymes?

• Primary structure proteins

• Secondary structure proteins

• Tertiary structure proteins

• Quaternary structure proteins

What is the function of enzymes?

• To provide structural support

• To store genetic information

• To catalyze different reactions

• To transport oxygen

What is the specific part of an enzyme that binds to the substrate?

• Reaction site

• Active site

• Catalytic site

• Binding site

What determines the unique 3D shape of an enzyme's active site?

• The sequence of nucleotides

• The sequence of carbohydrates

• The sequence of amino acids

• The sequence of lipids

What is the term used to describe the combination of an enzyme and its substrate?

• Enzyme-binding complex

• Enzyme-reaction complex

• Enzyme-product complex

• Enzyme-substrate complex

How do enzymes lower the activation energy of a reaction?

• By increasing the temperature

• By decreasing the temperature

• By increasing the concentration of reactants

• By providing an alternative reaction pathway

Which model suggests that the enzyme's active site is an exact fixed shape?

• Hand and glove model

• Lock and key model

• Induced fit model

• Substrate binding model

In the lock and key model, what happens to the substrate when it binds to the enzyme?

• It remains unchanged

• It slightly distorts in shape

• It changes color

• It breaks down immediately

What analogy is used to describe the induced fit model?

• Hand and shoe

• Key and lock

• Hand and glove

• Lock and key

What happens to the enzyme's active site after the products are released in the induced fit model?

• It remains in the same shape

• It becomes inactive

• It returns to its original shape

• It changes shape permanently