Enzymes and Compartmentalization in Cellular Processing
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Questions and Answers

What is the purpose of compartmentalization in a cell?

  • To decrease the catalytic function of enzymes
  • To decrease the efficiency of processing organelles
  • To increase the energy barrier needed for reactions
  • To promote the separation of components within a cell (correct)

How do enzymes lower the activation energy of a reaction?

  • By ensuring correct orientation of reacting molecules (correct)
  • By decreasing the fraction of molecules with sufficient energy to react
  • By decreasing the collision energy of molecules
  • By increasing the energetic barrier

What does the transition state represent in an enzyme-catalyzed reaction?

  • An inactive state where the reaction halts
  • A low energy state that the reaction passes through
  • A high energy state that the reaction needs to overcome (correct)
  • The most stable state of the reaction

How does the active site of an enzyme work enthalpically to lower enthalpy?

<p>By complementing and stabilizing the transition state (C)</p> Signup and view all the answers

Which statement accurately describes the role of enzymes in reaction kinetics?

<p>Enzymes increase the rate of reaction by lowering activation energy (A)</p> Signup and view all the answers

Why is compartmentalization important for processing efficiency in a cell?

<p>To separate different functions and processes within a cell (A)</p> Signup and view all the answers

Why do enzymes deliberately strain the E-S complex?

<p>To lower the energy state of the complex and change the relative energy difference to the transition state. (B)</p> Signup and view all the answers

Why are the best competitive inhibitors transition state analogs?

<p>They have the best fit to the transition state. (B)</p> Signup and view all the answers

What is the primary role of ligases among the classes of enzymes mentioned?

<p>Form bonds between two molecules coupled to ATP cleavage. (C)</p> Signup and view all the answers

What does acid catalysis involve in enzymatic mechanisms?

<p>Donating protons to stabilize leaving groups. (D)</p> Signup and view all the answers

How do enzymes create stereospecific interactions with chiral molecules?

<p>By preferentially binding to one enantiomer due to active site shape. (C)</p> Signup and view all the answers

Why do enzymes operate optimally at specific pHs and temperatures?

<p>To preserve appropriate ionization states of key amino acid residues. (D)</p> Signup and view all the answers

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