Biochemical Pathways Quiz
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Questions and Answers

Which enzyme deficiency may lead to Phenylketonuria?

  • Phenylalanine hydroxylase (correct)
  • Lipoprotein lipase
  • Carnitine
  • Arginase
  • Which enzyme catalyzes the synthesis of urea in the urea cycle?

  • Arginase (correct)
  • Thiophorase
  • Cycloogenase
  • Phenylalanine hydroxylase
  • From which amino acid is the neurotransmitter 5-hydroxytrptamine derived?

  • Tryptophan (correct)
  • Tyrosine
  • Glycine
  • Phenylalanine
  • What is the significant source of stored energy in the human body?

    <p>Adipose tissue</p> Signup and view all the answers

    Which enzyme catalyzes the synthesis of Prostaglandins?

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

    Which enzyme is involved in the synthesis of tyrosine from Phenylalanine?

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

    What is the enzyme involved in the entry of long chain fatty acids into mitochondria?

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

    What is the structural component of glutathione?

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

    Which hormone is a polypeptide in nature and not a steroid hormone?

    <p>ACTH (Adrenocorticotropic hormone)</p> Signup and view all the answers

    What is the precursor of vitamin niacin?

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

    Study Notes

    Enzyme Deficiencies and Their Effects

    • Deficiency of Phenylalanine hydroxylase leads to Phenylketonuria (PKU), causing accumulation of phenylalanine.

    Urea Cycle

    • Carbamoyl phosphate synthetase is the enzyme that catalyzes the synthesis of urea, converting ammonia and bicarbonate into carbamoyl phosphate.

    Neurotransmitter Biosynthesis

    • 5-Hydroxytryptamine (serotonin) is derived from the amino acid tryptophan.

    Energy Storage

    • The significant source of stored energy in the human body is triglycerides, primarily stored in adipose tissue.

    Prostaglandin Synthesis

    • Cyclooxygenase (COX) enzymes are responsible for the synthesis of prostaglandins from arachidonic acid.

    Amino Acid Conversion

    • The synthesis of tyrosine from phenylalanine is catalyzed by the enzyme phenylalanine hydroxylase.

    Fatty Acid Metabolism

    • The entry of long-chain fatty acids into the mitochondria is facilitated by the enzyme carnitine acyltransferase.

    Structural Components

    • Glutathione is composed of three amino acids: glutamate, cysteine, and glycine.

    Hormonal Classification

    • Insulin is an example of a polypeptide hormone, distinguishing it from steroid hormones.

    Vitamin Precursor

    • The precursor of vitamin niacin (B3) is tryptophan, which can be converted into niacin in the body.

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    Description

    Test your knowledge of biochemical pathways with this quiz. Questions cover topics such as the synthesis of tyrosine, urea cycle reactions, and the role of enzymes in metabolic disorders.

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