Question
Why insulin is being extracted from bacteria rather than animal source ?
Or
Name the source from whice insulin was extracted earlier.
Solution
Insulin is extracted from bacteria because bacteria is easy to manipulate and easy to grow. Insulin extracted from other organism caused allergies due to the presence of foreign gene. Since human gene can be linked to bacterial gene the insulin produced by it does not cause infection.
Insulin was earlier extracted from pancreas of slaughtered cows and pigs
Insulin was earlier extracted from pancreas of slaughtered cows and pigs