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).
In general, the enzymes that replicate and read DNA run in one direction along the single strand of DNA that they are operating on. The fact that the other strand of DNA is running in the opposite direction makes it impossible for these enzymes to jump from one strand to the other and ensures that they are operating on the proper information to do their job.