The quantitation of proteins due to their absorbance at ~280 nm (uv region) is due to the large absorptivity of the amino acids.

It is the aromatic amino acid. Aromatic amino acids and proteins assimilate UV light with two particular pinnacles. The pinnacle fixated on 280 nm is the after effect of absorbance by the sweet-smelling ring bit of their structure. The crest at bringing down wavelengths is caused by absorbance of peptide and carboxylic corrosive moieties in the mixes.

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.