Ch 38 - Tetrahydrofolate, Vitamin B12, and S-Adenosylmethionine

CO2 can be transferred from one carbon group to another via what molecule?
One-carbon groups at lower oxidation than CO2 are transferred via what 3 molecules?

CO2: Biotin
Lower than CO2: FH4 (Tetrahydrofolate), Vitamin B12, SAM (S-Adenosylmethionine)