Your heart then pumps it through your body to provide oxygen to the cells of your tissues and organs. As the cells use the oxygen, carbon dioxide is produced and absorbed into the blood. Your blood then carries the carbon dioxide back to your lungs, where it is removed from the body when you exhale.
DNA polymerase has 5'-3' activity. All known DNA replication systems require a free 3' hydroxyl group before synthesis can be initiated (note: the DNA template is read in 3' to 5' direction whereas a new strand is synthesized in the 5' to 3' directionâthis is often confused).
As the two strands of a double stranded nucleic acid molecule are antiparallel, the 5'â3' direction on the second strand corresponds to the 3'â5' direction along the first strand. In general, at most one reading frame in a given section of a nucleic acid is biologically relevant (open reading frame).