Topics:
Animal Nutrition, Animal Refresher
Match: Biochemical Precursors and Products
Match the column: Precursors to Biochemical Products
| Their precursor | Product |
|---|---|
| 1. Vitamin C | (a) Bili-verdin |
| 2. Catecholamines | (b) Cholesterol |
| 3. Vitamin D | (c) Hexose sugar |
| 4. Niacin | (d) Tyrosine |
| 5. Prostaglandin | (e) Tryptophan |
| 6. Bilirubin | (f) Arachidonic acid |
- 1-c, 2-d, 3-b, 4-e, 5-f, 6-a — Correct Answer
- 1-c, 2-b, 3-d, 4-e, 5-a, 6-f
- 1-e, 2-d, 3-b, 4-c, 5-f, 6-a
- 1-c, 2-e, 3-b, 4-d, 5-a, 6-f
Explanation:
Correct Answer: 1-c, 2-d, 3-b, 4-e, 5-f, 6-a
These are crucial metabolic precursor-product relationships in biochemistry: Vitamin C ← Hexose sugar; Catecholamines ← Tyrosine; Vitamin D ← Cholesterol; Niacin ← Tryptophan; Prostaglandins ← Arachidonic acid; Bilirubin → Bili-verdin.
Biochemical Precursor-Product Summary
| Product | Precursor | Notes |
|---|---|---|
| Vitamin C (Ascorbic acid) | Hexose sugar (glucose) | Via glucuronic acid pathway |
| Catecholamines (Epinephrine, Norepinephrine) | Tyrosine | Also → Thyroxine |
| Vitamin D (and all steroid hormones) | Cholesterol | UV light in skin for Vit D |
| Niacin (Nicotinic acid) | Tryptophan | 60 mg Trp = 1 mg Niacin |
| Prostaglandins | Arachidonic acid | C20 PUFA precursor |
| Bilirubin → Biliverdin | Haem (heme) catabolism | Biliverdin is the oxidized form |
Why Other Options Are Wrong
- All other options misplace at least one pair — particularly Niacin/Tryptophan vs Catecholamines/Tyrosine, and Bilirubin/Biliverdin.
📚 About this Topic — Animal Nutrition
This multiple choice question is from Animal Nutrition, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Nutrition to strengthen your preparation.
