Q:

The chemical structure of insulin

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The chemical structure of insulin.


  1. Contains a sterol ring.
  2. Is identical in all mammalian species.
  3. Is such that it is effective when taken by mouth.
  4. Has been synthesized in the laboratory.
  5. Can be synthesized by bacteria.

All Answers

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A. False It contains two peptide chains.

B. False Minor differences occur but these differences do not affect insulin action.

C. False Its peptide structure is broken down by digestive proteases in the gut.

D. True In 1964 by Katsoyannis.

E. True Using recombinant DNA.

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