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).
Replicating DNA. The dsDNA strand is unzipped by helicase and DNA synthesis occurs at the Y-shaped replication fork in the five prime (5â) to three prime (3â) direction. DNA has a direction because it is an asymmetrical molecule and the direction of the strand is determined by the orientation of the deoxyribose sugar.