DNA has four nucleobases: adenine, thymine, guanine, and cytosine. The nucleobases in a DNA strand have preferred partners to form hydrogen bonds with. Cytosine pairs with guanine, and adenine pairs with thymine. These are the base pairing rules that allow DNA replication and protein synthesis to happen.
C) it regulates what goes in and out of the cell Usually the membrane is the organelles that acts like a door. They decide what type of nutrients and molecules go into the cell.
