Question

There is no DNA in
A. Hair root
B. An encapsulated ovum
C. Mature RBCs
D. A mature spermatozoan

Answer 1

Hint: DNA or deoxyribonucleic acid is a macromolecule that is responsible for carrying the genetic information of an organism and is required for the proper growth, development, functioning and reproduction processes.

Complete answer:
DNA contains the coded information which are inherited and are genetically important molecules. All the different types of cells in an organism contain the DNA which remains in the nucleus of the cells. The DNA molecules contain the unique coded information and the information is arranged in the form sequences which forms the genes. The DNA are molecules that are contained in the nucleus of the cells. It is present in all the cells that contain a nucleus.
Hair is a filament made up of protein keratin and it grows out of the epidermis. The hair root lies below the skin layer and it remains enclosed within a follicle. The hair root contains nucleated cells which helps in the growth of the new hairs. The roots cells contain DNA in the hair.
The ovum is the female reproductive structure and it develops inside the ovary from the germinal cells. During its development, it remains encapsulated in sac known as the ovarian follicle. The ovum contains DNA as it is the haploid female reproducing cell.
The mature spermatozoon are the male reproductive cells and contain haploid chromosomes. It contains DNA which is passed on the offspring during fertilization.
RBC are the red blood cells are a type of blood cells and are responsible for the transportation of the oxygen to the different tissues of the body. The RBCs contain the pigment hemoglobin which is an iron rich molecule and it imparts the red colour of the cells. Mature RBCs are flexible and oval biconcave disks and they do not contain nucleus and other important cell organelles. AS they do not contain nucleus, they do not contain DNA as a part of their cell.

Hence, the correct answer is option (C).

Note: DNA is an important polymer and is responsible for containing the specific set of instructions needed for several biological processes. The DNA is contained in the nucleus of the cells. It is not present in non-nucleated cells such as RBCs but is present in hair roots, mature spermatozoan and an encapsulated ovum.