Which of the following statements are not true?
1. Insulin extraction initially involved the pancreas from slaughtered pigs and cattle.
2. Obtaining animal insulin presents challenges.
3. Animal insulin exhibits similarities to human insulin.
4. Allergic reactions may occur due to non-human insulin.
5. Recombinant DNA technology facilitated the integration of a human insulin gene into a bacterial vector.
6. E. coli bacterial cells serve as a source of recombinant insulin.
1 and 2
2 and 4
Only 3
Only 6
Option 3 states that "Animal insulin exhibits similarities to human insulin." However, this statement is not true. Animal insulin and human insulin have slight structural differences, although they share functional similarities. Animal insulin can be used to treat diabetes in humans, but it is not identical to human insulin.
Hence, the correct answer is option 3.