Protein Metabolism in Biology and Biochemistry
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Questions and Answers

What is the primary function of deamination in protein metabolism?

  • Formation of urea for excretion
  • Stimulation of the citric acid cycle
  • Removal of nitrogen atoms (correct)
  • Conversion of amino acids to glucose
  • Which process leads to the formation of urea in protein metabolism?

  • Transamination
  • Oxidative phosphorylation
  • Gluconeogenesis
  • Deamination (correct)
  • In which organ are branched-chain amino acids primarily deaminated?

  • Kidneys
  • Skeletal muscle (correct)
  • Liver
  • Heart
  • What happens to excess amino acids in terms of energy storage in the body?

    <p>Converted to fat for storage</p> Signup and view all the answers

    Which cycle is responsible for the excretion of nitrogen in the form of urea?

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

    What is the fate of nitrogen in muscle during protein metabolism?

    <p>Transferred to another amino acid</p> Signup and view all the answers

    What cofactor do Transferases use, derived from vitamin B6?

    <p>Pyridoxal phosphate</p> Signup and view all the answers

    Which enzyme is responsible for the deamination of glutamate?

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

    In the Urea cycle, what combines nitrogen from aspartate and an ammonium ion?

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

    Which of the following is a direct deaminated product of serine and threonine?

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

    How is nitrogen transported to the liver in the glucose-alanine cycle?

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

    Which enzyme catalyzes the formation of carbamoyl phosphate in the Urea cycle?

    <p>[ornithine] transcarbamylase</p> Signup and view all the answers

    Which enzyme is responsible for the formation of carbamoyl phosphate in the mitochondria?

    <p>Carbamoyl phosphate synthetase</p> Signup and view all the answers

    What is the first step in the synthesis of carbamoyl phosphate within the mitochondria?

    <p>Phosphorylation of bicarbonate</p> Signup and view all the answers

    In the urea cycle, which molecule is formed after the condensation of citrulline with aspartate?

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

    What is a consequence of phenylalanine hydroxylase deficiency in individuals?

    <p>Accumulation of phenylalanine</p> Signup and view all the answers

    Which amino acid is directly affected by phenylketonuria disease?

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

    What is the ultimate fate of urea in the body?

    <p>Excretion in urine</p> Signup and view all the answers

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