Question

DNA is associated with highly basic protein called
A) Histones
B) Non-Histones
C) Albumins
D) All of these

Answer 1

Hint: The basic unit of DNA is the nucleotides. The nucleotides are made up of a sugar group, phosphate and nitrogenous base. In a strand of DNA, nucleotides are linked with phosphate and sugars.

Complete Answer:
To answer the question we must know about the structure of DNA.
DNA in the nucleus is present in the super coiled state. This supercoiling of DNA helps it to fit inside the chromosome. The supercoiling of DNA is made possible by a protein called histones around which the DNA molecules wrap around. The histones are basic which binds the negative charged DNA together.
The chromatin looks like beads on the string called the nucleosomes. The DNA is wrapped around eight histone protein and forms histone octamers. Histones not only help in DNA compaction but also help in gene regulation.
Non-histones are the protein which is associated with DNA after the removal of histones.
Albumins are the group of proteins which are present in human plasma and are produced by the liver.

Thus the correct answer is (A). Highly basic protein associated with DNA is histones.

Note: Histones are present in the Eukaryotic cells. The histones act as the spool around which DNA winds. The synthesis of histone proteins takes place during chromatin duplication. These proteins are synthesised during the S-phase of the cell cycle.Histones are present abundantly in amino acid- lysine and arginine.