Role of Enzymes in Biochemical Reactions

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Questions and Answers

What is the role of enzymes in biochemical reactions?

  • To increase the rate of reactions (correct)
  • To reduce the concentration of reactants
  • To decrease the rate of reactions
  • To create new reactants

How does the absence of a catalyst affect biochemical reactions?

  • It increases the rate of reactions
  • It has no effect on the rate of reactions
  • It significantly prolongs the time required for reactions (correct)
  • It decreases the rate of reactions

What conditions can influence the rate of a chemical reaction?

  • Light intensity
  • Temperature, pressure, and pH (correct)
  • Sound frequency
  • Magnetic field strength

How does increased temperature affect the rate of chemical reactions?

<p>It increases the rate of reactions (D)</p> Signup and view all the answers

What is the role of reactant concentration in influencing the rate of a reaction?

<p>It increases the rate of reactions (C)</p> Signup and view all the answers

What is the main function of enzymes?

<p>Catalyze chemical reactions by lowering the activation energy (D)</p> Signup and view all the answers

What is the role of cofactors in relation to enzymes?

<p>Maintain the shape of the enzyme and help bind with substrates (C)</p> Signup and view all the answers

How is the enzyme-substrate complex formed?

<p>When sufficient amounts of enzyme and substrate collide and bind at the active site of the enzyme (B)</p> Signup and view all the answers

What are active sites on enzymes primarily responsible for?

<p>Binding substrates and catalyzing reactions (C)</p> Signup and view all the answers

Which model describes the active site of enzymes where substrates bind?

<p>Lock and key model (B)</p> Signup and view all the answers

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Study Notes

  • Enzymes are essential for increasing the speed of reactions in living organisms, allowing for the production of necessary biological molecules.
  • Enzymes lower the activation energy of reactions, enabling them to occur more efficiently.
  • Enzymes do not add to or change the overall energy of a reaction, only affecting the activation energy.
  • The main function of enzymes is to catalyze chemical reactions by lowering the activation energy.
  • Enzymes require cofactors to help maintain their shape and effectively bind with substrates.
  • The enzyme-substrate complex forms when sufficient amounts of enzyme and substrate collide and bind at the active site of the enzyme.
  • The enzyme undergoes a conformational change when the substrate binds to its active site, catalyzing the reaction.
  • Enzymes are protein structures with a specific three-dimensional shape, possessing an active site for binding substrates.
  • Active sites are the open spaces on enzymes where substrates bind, facilitating the conversion of the substrate into the intended product.
  • The active site can be described using the induced fit or lock and key model.
  • Enzymes, such as lactase, play important roles in the breakdown of various substances in the human body.
  • Lactase converts the sugar lactose into glucose and galactose by forming an enzyme-substrate complex and undergoing a conformational change.

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