Question

There is no DNA in

• A. Hair root
• B. An enucleated ovum
• C. A mature spermatozoan
• D. A mature RBC

Answer 1

The correct option is D

A mature RBC

The correct option is D:

The explanation for the correct option:

1. Mature RBCs lack a nucleus as well as DNA in them.
2. These structures are eliminated from the cell to accommodate more space in the cell which helps the RBC to carry more amount of oxygen in it.
3. In mammals, the mature RBCs are biconcave disc shaped cells that lack nuclei, ribosomes and other cytoplasmic organelles such as mitochondria.
4. Thus, they neither have nuclear DNA nor mitochondrial DNA.

The explanation for the incorrect option:

Option A:

1. Hair root or the follicle, the cells contain the nucleus in which DNA is present.
2. It is the living part of the cell which produces the shaft, hence it contains both the nucleus as well as the DNA.

Option B:

1. An enucleated ovum is one that does not contain a nucleus.
2. But DNA can be found in the mitochondria present in the ovum.

Option C:

1. A mature spermatozoan does contain both the nucleus as well as the DNA which can be found in the head region.

Final answer: There is no DNA in mature RBC.