Amino Acids

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1. Which of these is not the function of cysteine residue?

  • thiol side chain can form bonds with metal ions therefore prosthetic groups in the protien
  • CO-NH2 can react with sugars, olgiosaccharides and polysaccharides
  • Forms sulphide bonds in the amino acid structures
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2. Which fact about insulin is not correct?

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

3. Which of these are not reactions that occur to amino acids?

  • dehydrogenation
  • Hydration
  • Decarboxylation
  • Condensation
  • Transamination
  • Oxidative deamination

4. 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)

5. What are the precursors of Tryptophan and tyrosin?

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


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