<prompt> vitamin involved in 1 carbon metabolismFolic acidThiaminebiotinniacin  <response>: THFA is the carrier of One Carbon groups The folic acid is first reduced to 7,8-dihydrofolic acid and fuher reduced to 5,6,7,8-tetrahydrofolic acid THFA . Both reactions are catalyzed by NADPH dependent folate reductase. The THFA is the carrier of one-carbon groups. One carbon compound is an organic molecule that contains only a single carbon atom. The following groups are one carbon compounds: Formyl -CHO Formimino -CHNH Methenyl -CH Methylene -CH2- Hydroxymethyl -CH2OH Methyl -CH3. One carbon groups bind to THF through N5 are Formyl, Formimino or methyl N10 are Formyl Both N5 and N10 are Methylene and Metheny Ref: DM Vasudevan - Textbook of Biochemistry, 8th edition, page no: 475 