WK 10: Protein Metabolism
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Questions and Answers

Which of the following is NOT a source of dietary protein?

  • Meat
  • Chia
  • Quinoa
  • Fruits (correct)
  • Where does the digestion of dietary protein mainly occur?

  • Stomach
  • Small intestine (correct)
  • Large intestine
  • Mouth
  • What is the function of ubiquitin in protein metabolism?

  • Stimulates transcriptional activation
  • Inhibits proteolysis
  • Activates enzymes
  • Marking proteins for degradation (correct)
  • What is the result of protein turnover in the body?

    <p>No net change in protein levels</p> Signup and view all the answers

    How are amino acids absorbed in the small intestine?

    <p>As oligopeptides and single amino acids</p> Signup and view all the answers

    What is the term for the process of marking proteins for degradation?

    <p>Polyubiquitination</p> Signup and view all the answers

    What is the primary source of amino acids when demand is met?

    <p>Dietary protein</p> Signup and view all the answers

    What is the role of proteolysis in amino acid metabolism?

    <p>Breaking down existing proteins to provide energy</p> Signup and view all the answers

    What is the primary fate of amino acids absorbed from dietary protein?

    <p>Used for protein synthesis</p> Signup and view all the answers

    Why would we limit the use of protein as a source of energy?

    <p>Protein is needed for other bodily functions</p> Signup and view all the answers

    What is the role of glutamate dehydrogenase in amino acid metabolism?

    <p>Deaminating amino acids</p> Signup and view all the answers

    What is the primary function of the urea cycle?

    <p>Removing ammonia from the body</p> Signup and view all the answers

    What are the two main sources of amino acids?

    <p>Diet and protein degradation</p> Signup and view all the answers

    Where does the breakdown of dietary protein occur?

    <p>Small intestine</p> Signup and view all the answers

    What is the primary function of the urea cycle?

    <p>To excrete excess amino acids as urea</p> Signup and view all the answers

    During short-term starvation, what is used to provide energy?

    <p>Muscle</p> Signup and view all the answers

    What is the purpose of transamination?

    <p>To convert ketoacids to amino acids</p> Signup and view all the answers

    What is the name of the cycle that converts excess amino acids to urea?

    <p>Urea cycle</p> Signup and view all the answers

    What is the main site where digestion of dietary protein primarily occurs?

    <p>Stomach</p> Signup and view all the answers

    Which of the following statements about amino acid absorption is TRUE?

    <p>Amino acids leave the apical side of enterocytes</p> Signup and view all the answers

    Which of these processes involves the removal of an amino group from an amino acid?

    <p>Deamination</p> Signup and view all the answers

    What is the function of ubiquitin in protein metabolism?

    <p>Marking proteins for degradation</p> Signup and view all the answers

    Where do cytological peptidases degrade absorbed oligopeptides?

    <p>Intestinal lumen</p> Signup and view all the answers

    In protein metabolism, what is the process by which amino acids are newly formed?

    <p>Amination</p> Signup and view all the answers

    What is the primary source of essential amino acids?

    <p>Diet</p> Signup and view all the answers

    What is the process by which amino acids are broken down into their carbon skeletons and reused in metabolism?

    <p>Carbon skeleton reuse</p> Signup and view all the answers

    What is the name of the process by which proteins are broken down into amino acids?

    <p>Ubiquitin-mediated proteolysis</p> Signup and view all the answers

    What is the purpose of de novo protein synthesis?

    <p>To synthesize new proteins from amino acids</p> Signup and view all the answers

    What is the byproduct of the digestion of dietary protein?

    <p>Amino acids</p> Signup and view all the answers

    What is the function of the urea cycle?

    <p>To remove excess ammonia from the body</p> Signup and view all the answers

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