Enzymes and Their Functions

The video tutorial covers the role of enzymes in metabolism, focusing on their function as biological catalysts that speed up chemical reactions without being consumed. It explains the concept of activation energy and how enzymes lower it to facilitate reactions. The importance of enzymes in ensuring specific reactions occur without affecting others is highlighted. The tutorial also delves into enzyme-substrate interactions, the formation of enzyme-substrate complexes, and the induced fit model, which describes how enzymes adapt their shape to fit substrates.

What is the primary role of enzymes in chemical reactions?

• To alter the energy of the reactants

• To consume the reactants

• To speed up the reaction

• To change the products of the reaction

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Which term is synonymous with activation energy?

• Potential energy

• Kinetic energy

• Free energy of activation

• Thermal energy

What happens to enzymes after they catalyze a reaction?

• They remain unchanged

• They change their shape permanently

• They are consumed by the reaction

• They become inactive

How do enzymes affect the activation energy of a reaction?

• They decrease it

• They eliminate it

• They increase it

• They do not affect it

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Why can't we just add heat to speed up reactions instead of using enzymes?

• Heat is not effective in speeding up reactions

• Heat denatures proteins and is not specific

• Heat is too expensive

• Heat slows down reactions

What is the active site of an enzyme?

• The part where the enzyme is produced

• The part where the substrate binds

• The part that changes shape permanently

• The part that gets consumed

What is formed when an enzyme and a substrate bind together?

• A new substrate

• A new enzyme

• An enzyme-substrate complex

• A covalent bond

Which model describes how enzymes change shape to fit substrates?

• Rigid fit model

• Induced fit model

• Substrate fit model

• Lock and key model

How do enzymes provide a microenvironment for reactions?

• By forming a pocket with specific conditions

• By consuming the reactants

• By changing the temperature

• By altering the substrate permanently

What is the main function of enzymes in biological systems?

• To consume the substrates

• To change the products of reactions

• To lower the activation energy

• To increase the energy of reactants