Amino Acids

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1. Whichc of these statements are incorrect about glutathione?

  • important reducing and antibodies in cell
  • Protects heamoglobin from oxidation to methemoglobin
  • Protects cellular contents from oxidising agents eg peroxidase and superoxidase
  • Detoxification of xenobiotics in Pancrease
  • SH group of cysteine residue easily oxidised
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2. Which fact about insulin is not correct?

  • The 3rd sulphide bond is within one amino acid chain
  • The (one chain) precursor is proinsulin by proteolytic cleavage
  • Stimulates the muscles, liver, adipose cells to store glucose
  • Insulin formed by 2 polypeptide chains which are connected by 2 sulphur bond
  • Secreated by islets of Loughborough
  • Insulin is realeased when blood glucose sugar level is too high

3. which of theses acts as carnosine and aresine?

  • 2% conc found in skeletal mucles, they act as buffers
  • Produced Hydrolysis of methyl esters yeilds (toxic methanol)

4. Aspartame does not....

  • Hydrolysis of methyl esters yeilds (toxic methanol)
  • 2% conc found in skeletal mucles, they act as buffers
  • form a sweet taste, 200x stronger than sucrose

5. What are the precursors of Tryptophan and tyrosin?

  • Tryptophan= serotonin and nicotinamide, Tyrosin= thyroxin and catecolamines
  • Tryptophan= serotonin and catecolamines, Tyrosin= thyroxin and nicotinamide
  • Tryptophan= Thyroxin and catecolamines, Tyrosin= serotonin and nicotinamide


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