Protein Metabolism and Amino Acid Turnover Quiz
36 Questions
3 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the fate of excess and unwanted proteins in the body?

  • They are degraded to amino acids (correct)
  • They are excreted as urea
  • They are stored for future use
  • They are converted to glucose

    • Which amino acid is the major NH2-group donor for the synthesis of non-essential amino acids?

  • Alanine
  • Glycine
  • Glutamate (correct)
  • Leucine

    • What is the first step in the catabolism of amino acids?

  • Formation of ketone bodies
  • Conversion to glucose
  • Synthesis of body proteins
  • Removal of the NH2 group (correct)

    • Which vitamin is needed for the transamination of amino acids?

    <p>Vitamin B6 in the form of pyridoxal phosphate (D)</p> Signup and view all the answers

    Which enzyme catalyzes the reaction of transferring NH2 from majority of the amino acids to α-ketoglutarate?

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

    What activates glutamate dehydrogenase, the enzyme involved in the oxidative deamination of glutamate?

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

    Which enzyme is the rate-limiting enzyme in the urea cycle?

    <p>Carbamoyl phohphate synthetase-I (B)</p> Signup and view all the answers

    Where does the conversion of ammonia into urea take place?

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

    Which amino acids are classified as both glucogenic and ketogenic?

    <p>Tyrosine, isoleucine, phenylalanine, and tryptophan (B)</p> Signup and view all the answers

    Which intermediates can the carbon skeleton of amino acids be converted into?

    <p>Pyruvate and acetyl CoA (C)</p> Signup and view all the answers

    What are the genetic defects in amino acid metabolism caused by?

    <p>Mutations in the genes of the enzymes involved (C)</p> Signup and view all the answers

    Which condition results from mutations in the genes of the enzymes involved in amino acid metabolism?

    <p>Mental retardation and developmental disabilities (C)</p> Signup and view all the answers

    Which of the following amino acids are only ketogenic and not glucogenic?

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

    What is required in some places for the detection of genetic defects in amino acid metabolism in newborns?

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

    Which of the following is an important genetic defect in amino acid metabolism?

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

    What is the major transaminase involved in transamination of amino acids?

    <p>Alanine aminotransferase (ALT) (C)</p> Signup and view all the answers

    Which amino acid participates in transamination along with threonine?

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

    Which enzyme catalyzes the oxidative deamination of glutamate?

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

    Which amino acid is only ketogenic and not glucogenic?

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

    Which of the following is a precursor required for the urea cycle?

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

    Which enzyme is the rate-limiting enzyme in the urea cycle?

    <p>Carbamoyl phosphate synthetase-I (B)</p> Signup and view all the answers

    Which of the following amino acids can be converted into acetoacetate or acetyl CoA?

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

    Which amino acid is classified as both glucogenic and ketogenic?

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

    Which condition results from mutations in the genes of the enzymes involved in amino acid metabolism?

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

    What activates glutamate dehydrogenase, the enzyme involved in the oxidative deamination of glutamate?

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

    What is the fate of excess and unwanted proteins in the body?

    <p>Converted into urea (A)</p> Signup and view all the answers

    Which of the following is a common result of metabolic defects in amino acid metabolism?

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

    Which vitamin is needed for the transamination of amino acids?

    <p>Vitamin B6 (C)</p> Signup and view all the answers

    What is the first step in the catabolism of amino acids?

    <p>Removal of the NH2 group (A)</p> Signup and view all the answers

    Which enzyme catalyzes the transfer of NH2 from amino acids to α-ketoglutarate?

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

    What is the major NH2-group donor for the synthesis of non-essential amino acids?

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

    Which vitamin is needed in the form of pyridoxal phosphate for the transamination of amino acids?

    <p>Vitamin B6 (B)</p> Signup and view all the answers

    What is the major fate of excess and unwanted proteins in the body?

    <p>Degraded to amino acids (A)</p> Signup and view all the answers

    Which vitamin is required for transamination of amino acids?

    <p>Vitamin B6 (D)</p> Signup and view all the answers

    What is the first step in the catabolism of amino acids?

    <p>Removal of the NH2 group (A)</p> Signup and view all the answers

    What is the major NH2-group donor for the synthesis of non-essential amino acids?

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

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser