Discussion
Match the hormones in Group I with their metabolic precursor in Group II
| Group I | Group II |
|---|---|
| P. 17-β estradiol | 1. Arachidonic acid |
| Q. Thromboxane A2 | 2. Tyrosine |
| R. Epinephrine | 3. β-carotene |
| S. Retinoic acid | 4. Cholesterol |
Answer: C
The correct match is P-4, Q-1, R-2, S-3.
- 17-β estradiol is a steroid hormone made from cholesterol (P-4).
- Thromboxane A2 is an eicosanoid made from arachidonic acid by cyclooxygenase (Q-1).
- Epinephrine is a catecholamine made from tyrosine via DOPA and norepinephrine (R-2).
- Retinoic acid is made from vitamin A, which comes from β-carotene (S-3).
The other options pair estradiol with arachidonic acid or epinephrine with cholesterol or β-carotene, none of which is a precursor of those hormones.
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