DNA is made of repeating units called
The Correct Answer and Explanation is :
DNA, or deoxyribonucleic acid, is made of repeating units called nucleotides. Each nucleotide consists of three components: a phosphate group, a sugar molecule (deoxyribose), and a nitrogenous base. The structure of DNA is often described as a double helix, resembling a twisted ladder, where the sides of the ladder are formed by the sugar and phosphate groups, and the rungs are made up of pairs of nitrogenous bases.
There are four types of nitrogenous bases found in DNA: adenine (A), thymine (T), cytosine (C), and guanine (G). The specific pairing of these bases is crucial for the structure and function of DNA. Adenine pairs with thymine (A-T), and cytosine pairs with guanine (C-G), forming base pairs that hold the two strands of DNA together through hydrogen bonds.
The sequence of these nucleotides encodes genetic information. The order in which the nitrogenous bases are arranged determines the genetic instructions for building proteins and regulating various biological processes. This sequence is read in groups of three bases, known as codons, each of which corresponds to a specific amino acid or a stop signal during protein synthesis.
In addition to their role in encoding genetic information, nucleotides also play other essential roles in cellular processes. For example, adenosine triphosphate (ATP), a nucleotide, serves as the primary energy currency of cells, providing the energy required for many biochemical reactions.
The replication of DNA is equally important for cell division. During replication, the two strands of the DNA helix separate, and new nucleotides are added to form two identical copies of the original DNA molecule, ensuring that genetic information is accurately passed on to daughter cells.
In summary, nucleotides are the fundamental units of DNA, crucial for storing and transmitting genetic information and facilitating various cellular functions.