Question

What is the purpose of DNA?

Answer 1

“DNA is a molecule that carries and transmits hereditary information or genetic instructions from parents to offspring”.
This is also true for viruses, as most of these organisms' genetic material is either RNA or DNA. Some viruses, for example, may have RNA as their genetic material, whilst others may have DNA as their genetic material. After attaching itself to the host cell, the Human Immunodeficiency Virus (HIV) contains RNA, which is then transformed into DNA.

Complete answer:
Deoxyribonucleic acid, or DNA, is the hereditary substance found in all living things. It is primarily responsible for passing down hereditary materials or a set of genetic instructions from parents to offspring. Apart from that, DNA is essential for protein synthesis.
DNA holds all of an organism's instructions for growth, survival, and reproduction. DNA sequences must be turned into messages that can be utilised to make proteins, which are the complex molecules that do the majority of the work in our bodies, in order to perform these activities.

Note:
DNA types-
1. A-DNA is a right-handed double helix that looks identical to B-DNA. When DNA is dehydrated, it takes the A form, which protects it from harsh conditions like desiccation. Protein binding also removes the solvent from DNA, causing it to take on the shape of an A.
The most common DNA conformation is B-DNA, which is a right-handed helix.Under normal physiological settings, the majority of DNA has a B type shape.
2. Z-DNA is a left-handed DNA whose double helix winds in a zig-zag fashion to the left. Andres Wang and Alexander Rich were the ones who discovered it. Because it is situated before a gene's start site, it is thought to play a function in gene regulation.