reaction types

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Questions and Answers

Which enzyme classification catalyzes redox reactions?

  • EC 4) Lyases
  • EC 1) Oxidoreductases (correct)
  • EC 3) Hydrolases
  • EC 2) Transferases

What is the definition of a redox reaction?

  • A reaction that involves the transfer of electrons (correct)
  • A reaction that involves the transfer of energy
  • A reaction that involves the transfer of atoms
  • A reaction that involves the transfer of protons

What is the role of FAD/FADH2 in the citric acid cycle?

  • FAD is oxidized to make FADH2
  • FAD is reduced to make FADH2 (correct)
  • FADH2 is reduced to make FAD
  • FADH2 is oxidized to make FAD

What is the role of NAD+/NADH in the citric acid cycle?

<p>NAD+ is reduced to make NADH (B)</p> Signup and view all the answers

Which enzyme class is responsible for synthesizing molecules by catalyzing the transfer of a group from one molecule to another?

<p>EC 2) Transferases (B)</p> Signup and view all the answers

What mechanism is often used by transferases in their catalytic activity?

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

What types of oxidoreductases remove H's and donate them to a molecule other than oxygen?

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

Which of the following correctly identifies the nucleophile, electrophile, and leaving group in the formation of a disaccharide?

<p>Nucleophile: Electrophile: Leaving group: (A)</p> Signup and view all the answers

What makes an electrophile 'electron deficient'?

<p>Lack of electrons (C)</p> Signup and view all the answers

In DNA formation, what is the nucleophile, electrophile, and leaving group?

<p>Nucleophile: Electrophile: Leaving group: (A)</p> Signup and view all the answers

What is the nucleophile and electrophile in the formation of triglycerides?

<p>Electrophile: Nucleophile: (C)</p> Signup and view all the answers

What atom acts as the nucleophile in peptide bond formation?

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

What is the leaving group in a reaction where nitrogen acts as the nucleophile?

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

What is the biomolecule UDP used as in transfer reactions?

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

Which type of enzyme is responsible for hydrolyzing ATP to release a phosphate group?

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

What molecule is acting as a nucleophile in the hydrolysis reactions catalyzed by hydrolases?

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

What type of reaction is depicted in the hydrolysis of di-acyl-glycerol?

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

What is the enzyme class responsible for catalyzing the hydrolysis of glycosidic linkages?

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

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

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

What is removed in the elimination reaction catalyzed by dehydratases?

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

What type of isomerase catalyzes the interconversion of groups around an asymmetric carbon in a molecule with more than one asymmetric carbon?

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

Which enzyme class catalyzes reactions that join 2 molecules with the use of ATP for energy?

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

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

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

Which enzyme class catalyzes reactions involving the addition of water to a substrate?

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

What is the first step in the synthesis of glutathione, an important antioxidant in our bodies?

<p>Joining of glutamate and cysteine (B)</p> Signup and view all the answers

Which enzyme class catalyzes reactions involving the removal of a carboxyl group from a substrate?

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

What is the name of the enzyme class that catalyzes hydrolysis reactions?

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

Which enzyme class catalyzes reactions involving the transfer of a functional group from one molecule to another?

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

What is the name of the enzyme class that catalyzes redox reactions?

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

Which enzyme class catalyzes reactions involving the elimination of water from a substrate?

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

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