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 (D)</p> Signup and view all the answers

What enzyme carries out the reaction below?

<p>mutase (B)</p> Signup and view all the answers

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

<p>NAD (B)</p> Signup and view all the answers

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

<p>dehydratase (B)</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 (C)</p> Signup and view all the answers

What are FAD/FADH2?

<p>Coenzymes (B)</p> Signup and view all the answers

What is an oxidase reaction?

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

What is the role of a phosphatase?

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

What is the definition of a polymerase?

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

ATPase is responsible for...

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

What type of biomolecule is UDP?

<p>Nucleotide (D)</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 (A)</p> Signup and view all the answers

Why is UDP a better leaving group than OH?

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

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

G6P -> Glucose

<p>Phosphatase (D)</p> Signup and view all the answers

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

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

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

<p>Nucleophile (D)</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 (A)</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 (D)</p> Signup and view all the answers

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

<p>Synthase (D)</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 (C)</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 (B)</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 (C)</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 (B)</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 (C)</p> Signup and view all the answers

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

<p>Hydratase (B)</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 (D)</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 (B)</p> Signup and view all the answers

Which enzyme transfers a functional group intermolecularly?

<p>Mutase (C)</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 (C)</p> Signup and view all the answers

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