KROK 1 2018 – Question 156 · KROK (Medicine) · Biological Chemistry
One of the causes of pernicious anemia is disturbed synthesis of transcorrin (Castle’s intrinsic factor) by the parietal cells of the stomach. What substance is called Castle’s extrinsic factor?
- A. Biotin
- B. Cobalamin
- C. Riboflavin
- D. Folic acid
- E. Pyridoxine
Hint
Castle's concept pairs a factor made by the stomach with one that must come from food; ask which vitamin's absorption depends on such a partner, so that its deficiency produces pernicious anemia.
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