Question

Prokaryotic genetic system contains
A) DNA and histone.
B) DNA but no histone.
C) Histone but no DNA.
D) Neither DNA nor histone.

Answer 1

Hint:Prokaryotic organisms- (Pro-primitive, karyon-nucleus). The prokaryotes are unicellular single celled organisms that do not have membrane bound organelles. They lack a true nucleus i.e. they do not contain a well bound nuclear membrane.

Complete answer:
The nucleus or genetic material is absent in prokaryotes. Nucleus contain nuclear material called as nucleolus or nucleic acids which plays an important role in genetics and heredity i.e. transmission of characters from parent to offspring takes place with the help of nuclear material.
Prokaryotic genetic system contains neither DNA nor histones. DNA stands for deoxyribonucleic acid. DNA is double stranded, double helical spiral shaped in structure. DNA is a polymer that contains many small units called nucleotides as monomers. Nucleotides is the name given to assembly of nucleic acid, proteins and deoxyribose pentose sugar. Prokaryotes do not have a well bound nuclear membrane and are not so advanced. The histone proteins help in binding of chromosomes. They help in binding or coiling of DNA.

Therefore, from the above explanation, the correct option is (D) Neither DNA nor histone.

Note:With the help of genetics, many difficult tasks have been made simple such as suspects can be found out and can be punished. Also, many other things can be solved with the help of DNA and genetics.