Enzyme classifications

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Questions and Answers

Which one of these is the nucleophile in disaccharide formation?

  • Atom with lone electron pair (correct)
  • Group that will be substituted for by 'A'
  • Electron deficient atom
  • + B-X

Which one of these is the electrophile in disaccharide formation?

  • Atom with lone electron pair
  • Group that will be substituted for by 'A'
  • Electron deficient atom
  • + B-X (correct)

Which one of these is the leaving group in disaccharide formation?

  • Electron deficient atom (correct)
  • Group that will be substituted for by 'A'
  • Atom with lone electron pair
  • + B-X

What makes an electrophile 'electron deficient'?

<p>Electron deficient atom (A)</p> Signup and view all the answers

Which one of these is the nucleophile in DNA formation?

<p>Atom with lone electron pair (B)</p> Signup and view all the answers

Which one of these is the electrophile in DNA formation?

<p>Electron deficient atom (A)</p> Signup and view all the answers

Which arrow correctly identifies the nucleophile and electrophile in the formation of triglycerides?

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

Which type of reaction is depicted in the image depicting lipid hydrolysis?

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

What is the enzyme class for the specific enzyme involved in lipid hydrolysis?

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

What is the specific enzyme involved in lipid hydrolysis?

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

What type of reaction is depicted in the image depicting amylase hydrolysis?

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

What is the enzyme class for the specific enzyme involved in amylase hydrolysis?

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

What physiological process uses the last 3 reactions (lipid hydrolysis, amylase hydrolysis, and peptide bond cleavage)?

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

Enzymes are classified into different classes based on their functions. Which class of enzymes catalyzes redox reactions?

<p>EC 1 (D)</p> Signup and view all the answers

What is the meaning of the term 'redox' in the context of enzymes?

<p>Redox refers to reduction and oxidation (D)</p> Signup and view all the answers

What defines a redox reaction?

<p>Loss of Electrons = Oxidation, Gain of Electrons = Reduction (C)</p> Signup and view all the answers

In the redox example of the CAC (Citric Acid Cycle), which molecule has water added to it to make malate?

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

What are FAD/FADH2?

<p>Flavin Adenine Dinucleotide/Flavin Adenine Dinucleotide Hydrogen (B)</p> Signup and view all the answers

What are NAD+/NADH?

<p>Nicotinamide Adenine Dinucleotide/Nicotinamide Adenine Dinucleotide Hydrogen (A)</p> Signup and view all the answers

Which enzyme class is responsible for redox reactions?

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

Which enzyme class is responsible for hydrolysis reactions?

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

Which enzyme class is responsible for group transfer reactions?

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

Which enzyme class is responsible for condensation reactions?

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

Which enzyme class is responsible for decarboxylation/elimination reactions?

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

Which enzyme class is responsible for dehydration/elimination reactions?

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

Which enzyme class is responsible for hydration/addition reactions?

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

Which enzyme class is responsible for joining molecules with the use of ATP?

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

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Study Notes

Disaccharide Formation

  • In disaccharide formation, the nucleophile is the hydroxyl group of one monosaccharide.
  • The electrophile is the anomeric carbon of the other monosaccharide.
  • The leaving group is the hydroxyl group that was initially attached to the anomeric carbon.

Characteristics of Electrophiles

  • An electrophile is considered "electron deficient" due to a partially positive charge or a lack of electrons.

DNA Formation

  • In DNA formation, the nucleophile is the 3'-hydroxyl group of one nucleotide.
  • The electrophile is the 5'-phosphate group of the other nucleotide.

Triglyceride Formation

  • The nucleophile is the hydroxyl group of glycerol, and the electrophile is the acyl group of the fatty acid.

Lipid Hydrolysis

  • The reaction depicted in lipid hydrolysis is a hydrolysis reaction.
  • The enzyme class involved in lipid hydrolysis is hydrolases.
  • The specific enzyme involved in lipid hydrolysis is lipase.

Amylase Hydrolysis

  • The reaction depicted in amylase hydrolysis is a hydrolysis reaction.
  • The enzyme class involved in amylase hydrolysis is hydrolases.
  • The specific enzyme involved in amylase hydrolysis is amylase.

Physiological Process

  • The physiological process that uses lipid hydrolysis, amylase hydrolysis, and peptide bond cleavage is digestion.

Enzyme Classification

  • Enzymes are classified into different classes based on their functions.
  • The enzyme class that catalyzes redox reactions is oxidoreductases.
  • The term "redox" in the context of enzymes refers to oxidation-reduction reactions.
  • A redox reaction is defined as a reaction involving the transfer of one or more electrons.

Redox Reactions

  • In the redox example of the Citric Acid Cycle, water is added to fumarate to make malate.
  • FAD/FADH2 are electron carriers that facilitate redox reactions.
  • NAD+/NADH are electron carriers that facilitate redox reactions.

Enzyme Classes

  • Oxidoreductases are responsible for catalyzing redox reactions.
  • Hydrolases are responsible for catalyzing hydrolysis reactions.
  • Transferases are responsible for catalyzing group transfer reactions.
  • Ligases are responsible for catalyzing condensation reactions.
  • Lyases are responsible for catalyzing decarboxylation/elimination reactions.
  • Isomerases are responsible for catalyzing dehydration/elimination reactions.
  • Hydratases are responsible for catalyzing hydration/addition reactions.
  • Ligases are responsible for catalyzing the joining of molecules with the use of ATP.

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