DNA

DNA, or deoxyribonucleic acid, is the molecule that carries the genetic instructions used in the growth, development, functioning, and reproduction of all living organisms. It is composed of two long chains of nucleotides twisted into a double helix structure. Each nucleotide consists of a sugar, a phosphate group, and a nitrogenous base. The four types of nitrogenous bases in DNA are:

Adenine (A)

Thymine (T)

Cytosine (C)

Guanine (G)

In DNA, adenine pairs with thymine, and cytosine pairs with guanine. This sequence of bases forms the genetic code, which determines an organism's characteristics.

DNA is found in the nucleus of eukaryotic cells and in the cytoplasm of prokaryotic cells. The molecule is organized into chromosomes, with humans having 23 pairs of chromosomes, containing the complete set of genetic information.

DNA replication is the process by which DNA makes a copy of itself during cell division, ensuring genetic material is passed on to daughter cells.

Key Uses of DNA:

Genetics: DNA determines inherited traits.

Forensic Science: DNA analysis is used for identifying individuals in criminal investigations.

Biotechnology: DNA is used in genetic engineering to create genetically modified organisms (GMOs).

Medicine: DNA testing can be used to diagnose diseases and assess genetic risks.