This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
The gene for folic acid transpoer is located on which chromosome: 
Select and explain. 
A. 5, B. 15, C. 21, D. X
C: 21
Answer: C: 21 
Explanation: C i.e. 21Folic acid transpoer gene (SLC 19 AI solute carrier family 19) is located on long arm of chromosome 21 (21q) Q at band 22.3. Transpo of folate occurs by potocytosis which functionally couples folate receptor, folate transpoer and V- type h+ pump.