Transaminases: Enzymes and Features
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Questions and Answers

Which enzyme is responsible for cleaving one amino acid at a time from amino terminals of peptides?

  • Dipeptidase
  • Pepsin
  • Aminopeptidase (correct)
  • Tripeptidase

Where does the absorption of amino acids primarily occur?

  • Stomach
  • Pancreas
  • Upper small intestine (correct)
  • Large intestine

Which enzyme catalyzes the reversible transfer of an amino group between an 'α' amino acid and an 'α' keto acid?

  • Phosphatase
  • Kinase
  • Transaminase (correct)
  • Dehydrogenase

Which phase of protein digestion involves the conversion of casein into calcium paracaseinate?

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

Except for lysine, threonine, proline, and hydroxyproline, which amino acids undergo transamination reactions?

<p>Alanine, leucine, isoleucine, valine (A)</p> Signup and view all the answers

What is the energy-dependent process by which amino acids are absorbed along with sodium?

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

What is the main function of transamination reactions in the body?

<p>Synthesis of essential amino acids (A)</p> Signup and view all the answers

What is the total pool of amino acids available in the blood at any given time called?

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

In which conditions are transaminase levels typically increased, making them useful in diagnosis?

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

Which enzyme converts dipeptides to amino acids?

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

What is the fate of ammonia generated from deamination reactions in the body?

<p>Converted to urea for excretion (C)</p> Signup and view all the answers

How is the toxic ammonia transported in the body to prevent its harmful effects?

<p>As glutamine from muscle to liver (A)</p> Signup and view all the answers

Which of the following amino acids can be used to synthesize glycine?

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

What are the substrates for Glycine synthase in the biosynthesis of glycine?

<p>CO2 and NH3 (A)</p> Signup and view all the answers

In the degradation of glycine, which molecule is not involved as a precursor for glycine synthesis?

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

Which amino acid is a nitrogen atom donor in the urea cycle?

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

Which molecule is a positive allosteric effector of carbamoyl phosphate synthetase1 (CPS-1)?

<p>N-acetyl glutamate (A)</p> Signup and view all the answers

Which treatment option is used to remove ammonia from blood in urea cycle defects?

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

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