<prompt> Proteins seen in chromosomes are called:NucleotidesHistonesApoproteinsGlycoproteins  <response>: Ans: b Histones Ref: Vasudevan, 4th ed, p. 398; 5th ed, p. 416 Histones are proteins rich in basic amino acids. DNA wraps around histone octamer to form one nucleosome. Histones are rich in lysine and arginine. Histone octamer contains two copies each of histones H2A, H2B, H3 H4 H, histone is associated with the linker DNA found between nucleosomes. Eu chromatin - loosely packed and transcriptionaly active. Hetero chromatin - tightly packed and inactive.Topo isomearses are enzymes that can change the amount or super coiling. 