This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
Nucleosomes are 
Select and explain. 
A. DNA+RNA, B. DNA+Histones, C. RNA+Histones, D. DNA+RNA+Histones
B: DNA+Histones
Answer: B: DNA+Histones 
Explanation: Nucleosomes : The double stranded DNA wraps twice around a histone octamer formed by H2A, H2B, H3 and H4. This super - twisted helix forms a spherical paicle of 10nm diameter ; called Nucleosome. The function of the Nucleosomes is to condense DNA ; this arrangement also stabilises the DNA. REF : DM.VASUDEVAN.TEXTBOOK; SEVENTH EDITION ; PAGE NO :577