DNA molecules can be very large. DNA contains a code with information that regulates the activities of a cell. The DNA code controls the chemical changes that make up a cell's life activities. Genes responsible for different inherited traits are short sections of DNA molecules. DNA regulates a cell by controlling the production of cell enzymes and other proteins.
Enzymes regulate the chemical changes involved in cell activities such as respiration.
DNA also has the ability to replicate or make more DNA just like itself. DNA is a long, threadlike molecule with the shape of a double helix. The shape of a helix is like a corkscrew. The two helixes in the module wind around each other and are connected by bonds that form a spiral ladder. RNA works together with DNA to regulate a cell.