Notch : is a V or U shaped cut into one edge of sheet film. It denotes the location of the sensitive side of the film as well as identifying the type of film.
Deoxyribonucleic Acid [DNA]
Deoxyribonucleic acid is a molecule that encodes the genetic instructions used in the development and functioning of all known living organisms and many viruses. DNA and RNA are nucleic acids; alongside proteins, they compose the three major macromolecules essential for all known forms of life.
