1 DNA is a polymer. 2  Individual monomer units are called nucleotides. 3  The DNA polymer is composed of: 4  a backbone of molecules of the sugar deoxyribose (a 5 carbon sugar). 5  phosphate groups linking the deoxyribose sugar molecules together in a chain. The DNA polymer is composed of: 2  a backbone of molecules of the sugar deoxyribose (a 5 carbon sugar). 3  phosphate groups linking the deoxyribose sugar molecules together in a chain. 4  four principal bases (2 are pyrimidines and 2 are purines):
Rods and cones function as photoreceptors in the retina of the eye, turning visible light into neuronal signals, which are sent to the brain. This process is called transduction. Rods and cones perform at different wavelengths and sensitivities allowing detailed perception of light and color.
The function of the cell membrane is to let particles in and out of the cell. If they are to big then they need to go through channel proteins. If not they can go through the cell membrane itself and in to the rest of the plant cell as a whole.function of a nucleus is that it stores the cells DNA (hâ¦.Popularity: 165.he function of the cell membrane is to let particles in and out of the cell. If they are to big then they need to go through channel proteins. If not they can go through the cell membrane itself and in to the rest of the plant cell as a whole.function of a nucleus is that it stores the cells DNA (hâ¦.