Biochem 2: Enzyme Classifications and Reaction Types
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Questions and Answers

What is true about nucleophiles and electrophiles?

  • The nucleophile attacks the electrophile to cause a group to leave
  • The nucleophile is electron rich, looking for a place to put its lone pair of electrons
  • The electrophile wants to accept electrons
  • All of these answers are correct (correct)
  • Which of the following enzyme classifications catalyzes redox reactions?

  • Hydrolases
  • Oxidoreductases (correct)
  • Transferases
  • Lyases
  • What makes the electrophile 'electron deficient'?

  • It has a negative charge
  • It has a positive charge (correct)
  • It has a lone pair of electrons
  • It has a full octet of electrons
  • In the Krebs cycle, which molecule is oxidized to make Fumerate?

    <p>Succinate</p> Signup and view all the answers

    What enzyme carries out the reaction below?

    <p>mutase</p> Signup and view all the answers

    In the Krebs cycle, which molecule is reduced to make NADH?

    <p>NAD</p> Signup and view all the answers

    What specific type of enzyme do you think would catalyze the reaction below?

    <p>dehydratase</p> Signup and view all the answers

    What type of enzyme catalyzes the transfer of a phosphate from ATP to another molecule other than water?

    <p>kinase</p> Signup and view all the answers

    What are FAD/FADH2?

    <p>Coenzymes</p> Signup and view all the answers

    What is an oxidase reaction?

    <p>removes H and donates it to oxygen</p> Signup and view all the answers

    What type of oxidoreductase removes H's and donates them to a molecule other than oxygen?

    <p>Dehydrogenases</p> Signup and view all the answers

    What is the role of a phosphatase?

    <p>removes a phosphate group from a monophosphate (protein)</p> Signup and view all the answers

    What is the definition of a polymerase?

    <p>transfer of a monomer to a polymer</p> Signup and view all the answers

    ATPase is responsible for...

    <p>hydrolyzing ATP to release a phosphate group</p> Signup and view all the answers

    What type of biomolecule is UDP?

    <p>Nucleotide</p> Signup and view all the answers

    Which of the following enzyme classifications synthesizes molecules by catalyzing the transfer of a group from one molecule to another?

    <p>Transferases</p> Signup and view all the answers

    Why is UDP a better leaving group than OH?

    <p>It has a lone pair of electrons</p> Signup and view all the answers

    What type of hydrolase enzyme is being used in the reaction shown below?

    G6P -> Glucose

    <p>Phosphatase</p> Signup and view all the answers

    What is the mechanism often used by transferases in synthesizing molecules?

    <p>Nucleophilic substitution</p> Signup and view all the answers

    What is the atom with a lone electron pair in nucleophilic substitution?

    <p>Nucleophile</p> Signup and view all the answers

    Which type of enzyme is responsible for the removal of water to form a double bond in a molecule?

    <p>Dehydratase</p> Signup and view all the answers

    What is the name of the enzyme that adds or removes a carboxyl group from an organic compound?

    <p>Decarboxylase</p> Signup and view all the answers

    What type of enzyme joins two molecules by creating a new C-C bond?

    <p>Synthase</p> Signup and view all the answers

    What is the name of the enzyme that interconverts the groups around an asymmetric carbon in a molecule that has more than one asymmetric carbon?

    <p>Epimerase</p> Signup and view all the answers

    What type of enzyme catalyzes various reactions that join two molecules with the use of ATP for energy?

    <p>Ligase</p> Signup and view all the answers

    What is the name of the enzyme that joins glutamate and cysteine to form γ-glutamylcysteine?

    <p>Glutamate-cysteine ligase</p> Signup and view all the answers

    Which type of enzyme is responsible for the elimination of a carboxyl group from an organic compound?

    <p>Decarboxylase</p> Signup and view all the answers

    What is the name of the enzyme that interconverts the groups around an asymmetric carbon in a molecule that only has one asymmetric carbon?

    <p>Racemase</p> Signup and view all the answers

    What type of enzyme is responsible for the addition of water to a molecule?

    <p>Hydratase</p> Signup and view all the answers

    What is the name of the enzyme that converts citrate to isocitrate in the citric acid cycle?

    <p>Aconitate hydratase</p> Signup and view all the answers

    Match the enzymes with their classification of reactions:

    <p>Dehydrogenase = Oxidoreductase Kinase = Transferase Phosphatase = Hydrolase Hydratase = Lyase</p> Signup and view all the answers

    Match the following enzymes with their classification of reactions:

    <p>Oxydase = Oxidoreductase Polymerase = Transferase ATPase = Hydrolase Dehydratase = Lyase</p> Signup and view all the answers

    Match the following enzymes with their classification of reactions:

    <p>Decarboxylase = Lyase Synthase = Lyase Mutase = Isomerase Epimerase = Isomerase</p> Signup and view all the answers

    Match the following enzymes with their classification of reactions:

    <p>Racesemase = Isomerase synthetase = Ligase Hydratase = Lyase Mutase = Epimerase</p> Signup and view all the answers

    Match the following lyase enzymes with the type of reaction they are:

    <p>Hydratase = Addition Dehydratase = Elimination Decarbolzyase = Elimination Synthase = Condensation</p> Signup and view all the answers

    What enzyme makes a new C-C bond from the joining of 2 molecules?

    <p>Synthase</p> Signup and view all the answers

    Which enzyme transfers a functional group intermolecularly?

    <p>Mutase</p> Signup and view all the answers

    Match the isomerase enzyme to its function:

    <h1>Epimerase = Interconversion of a molecule around an asymetrical C in a molecule with more than 1 asymmetrical C Racemase = Interconversion of groups around an asymmetrical C in a molecule with 1 asymmetrical C Mutase = transfer of a functional group intermolecularly</h1> Signup and view all the answers

    What is the function of a ligase?

    <p>joins 2 molecules with the use of ATP</p> Signup and view all the answers

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