Protein Digestion and Metabolism Quiz

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Questions and Answers

Which enzyme targets neutral nonpolar amino acids during protein digestion?

  • Trypsin
  • Peptidases
  • Carboxypeptidase A (correct)
  • Chymotrypsin

Which transporter is responsible for the absorption of dipeptides and tripeptides?

  • Several brush border AA transporters
  • PEPT1 (H+) (correct)
  • Sodium dependent transporters
  • Several basolateral membrane AA transporters

Which amino acids have the quickest transporter affinity during protein absorption?

  • Met, leu, ile, val (correct)
  • Glutamate and aspartate
  • Neutral amino acids
  • Basic amino acids

What process involves the removal of the amino group from an amino acid?

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

What is the end product of deamination?

<p>Ammonia and keto acid (B)</p> Signup and view all the answers

Which organ is responsible for ammonia excretion?

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

What is the main purpose of protein catabolism?

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

Which expert consultation report is referenced in the text?

<p>WHO/FAO/UNU Expert Consultation (A)</p> Signup and view all the answers

What is the full name of the lecturer mentioned in the text?

<p>Aifric O’Sullivan (D)</p> Signup and view all the answers

Which protein digestion enzyme targets basic amino acids?

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

Which enzyme is responsible for targeting aromatic amino acids during protein digestion?

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

Which transporter is responsible for the absorption of dipeptides and tripeptides?

<p>PEPT1 (C)</p> Signup and view all the answers

What is the end product of transamination?

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

Which amino acids have the slowest transporter affinity during protein absorption?

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

What is the main function of peptidases during protein digestion?

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

What is the main purpose of deamination during protein metabolism?

<p>Amino acid synthesis (C)</p> Signup and view all the answers

Which organ is responsible for ammonia excretion during urea synthesis?

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

Which amino acids have the quickest transporter affinity during protein absorption?

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

Which enzyme is responsible for targeting basic amino acids during protein digestion?

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

Which amino acids are considered dispensable during protein metabolism?

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

Flashcards

Carboxypeptidase A target amino acids

Carboxypeptidase A targets neutral nonpolar amino acids during protein digestion.

PEPT1's role

PEPT1 (H+) transporter is involved in the absorption of dipeptides and tripeptides.

Fastest absorbing amino acids

Methionine (Met), leucine (leu), isoleucine (ile), and valine (val) have the quickest transporter affinity during protein absorption.

Deamination process

Deamination is the removal of the amino group from an amino acid.

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Deamination product

The end product of deamination is ammonia and a keto acid.

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Ammonia excretion organ

The liver is responsible for ammonia excretion.

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Protein catabolism purpose

The main purpose of protein catabolism is energy production.

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Trypsin's target amino acids

Trypsin targets basic amino acids during protein digestion.

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Chymotrypsin's target amino acids

Chymotrypsin targets aromatic amino acids during protein digestion.

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Transamination product

The end product of transamination is an amino acid.

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Slowest absorbing amino acids

Glutamate and aspartate have the slowest transporter affinity during protein absorption.

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Peptidases' role

Peptidases' main function during protein digestion is protein metabolism.

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Deamination's purpose

Deamination during protein metabolism aims at amino acid synthesis.

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Ammonia excretion location (urea)

The liver handles ammonia excretion during urea synthesis.

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Met and Leu affinity

Methionine (Met) and leucine (leu) have the quickest transporter affinity during protein absorption.

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Dispensable amino acids

Neutral amino acids are considered dispensable during protein metabolism.

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Study Notes

Protein Digestion

  • Trypsin targets neutral nonpolar amino acids during protein digestion.
  • Chymotrypsin targets aromatic amino acids during protein digestion.
  • Carboxypeptidase targets basic amino acids during protein digestion.
  • Peptidases break down dipeptides and tripeptides during protein digestion.

Protein Absorption

  • The PepT1 transporter is responsible for the absorption of dipeptides and tripeptides.
  • Proline, hydroxyproline, and glycine have the slowest transporter affinity during protein absorption.
  • Basic and neutral amino acids have the quickest transporter affinity during protein absorption.

Protein Catabolism

  • Deamination is the process of removing the amino group from an amino acid.
  • The end product of deamination is ammonia.
  • The main purpose of protein catabolism is to produce energy.
  • The liver is responsible for ammonia excretion during urea synthesis.
  • Transamination involves the transfer of the amino group from one amino acid to another.
  • The end product of transamination is a different amino acid, often an α-keto acid.

Additional Information

  • The text references the Expert Consultation Report on Protein and Amino Acid Requirements in Human Nutrition for information on protein requirements.
  • The lecturer's full name is Dr. [lecturer's name].
  • Dispensable amino acids can be synthesized by the body.

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