First crystalline hormone is:
Correct answer: A. Thyroxine
- A. Thyroxine
- B. Non_adrenaline
- C. Adrenaline
- D. All of above
Explanation
Thyroxine: Thyroxine was the first hormone to be isolated and crystallized in 1914, making it a significant milestone in endocrinology. This historical fact makes it the correct answer to this question. Non-adrenaline and adrenaline are not crystalline hormones, so they are incorrect choices. The option 'All of above' is also incorrect because not all options listed are correct.
This question appeared on the ETEA MDCAT 2009 paper, which you can sit online with every answer explained.
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