Amino Acids

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1. 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
  • Secreated by islets of Loughborough
  • Insulin is realeased when blood glucose sugar level is too high
  • Insulin formed by 2 polypeptide chains which are connected by 2 sulphur bond
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2. Which of these functions is incorrect about Vasopressin?

  • Used for Lactation
  • slow degradation of vasopressin for diabetic urinal excretion
  • Used to control blood pressure (increases)
  • regulates the excretion of water by kidneys

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. 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

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

  • CO-NH2 can react with sugars, olgiosaccharides and polysaccharides
  • Forms sulphide bonds in the amino acid structures
  • thiol side chain can form bonds with metal ions therefore prosthetic groups in the protien

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