Chemistry Macromolecules / Biochemistry SZABMU 2024
PMDC Verified Question 1 of 47
Based on function thyroxin can be classified as
A
Structural protein
B
Hormonal protein
C
Genetic protein
D
Transport protein
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Hormonal protein
Concept:

Thyroxin is an amino acid derivative acting as a systemic chemical messenger.

Formula:

$$N/A$$

Solution:

  • Thyroxin (T4) is secreted into the blood by the thyroid gland to regulate basal metabolic rate.
  • Because its physiological role is entirely regulatory and acts at distant target tissues, it is functionally classified as a hormonal protein (or hormonal derivative).


Why other options are incorrect:

It is not used to build tissues (structural), it doesn't ferry other molecules in the blood (transport), and it is not a histone involved in DNA packing (genetic).

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