This Unit Specifically Studies The Molecule Known As Dna Or Deoxyribo This unit specifically studies the molecule known as DNA, or deoxyribonucleic acid. DNA is the genetic material of all living organisms. DNA is a nucleic acid. Nucleic acids are a type of organic molecules that contain genetic material. DNA is found in the nucleus of every cell in the human body. Cells of living things are made of prokaryotic cells or eukaryotic cells. In prokaryotic cells, DNA is circular, and in eukaryotic cells, DNA is linear. The human body is made of eukaryotic cells, which is why your chromosomes are linear. The majority of the work involved in forensics is based on DNA. History discusses many people as having input into the discovery of DNA, but the most familiar names are James Watson and Francis Crick.
Paper For Above instruction The discovery of DNA marks one of the most significant milestones in biological science. The history of DNA research stretches back to the 19th century when Friedrich Miescher first isolated a substance he called "nuclein" from cell nuclei in 1869. This substance was later identified as DNA, but its function remained unknown for many decades. Throughout the 20th century, many scientists contributed to understanding DNA's structure and function, including Chargaff's rules in the 1940s, which described the base pairing rules, and the pivotal discoveries made through X-ray diffraction studies by Rosalind Franklin. Franklin's photographs revealed the helical structure of DNA, which was critical in elucidating its shape. The breakthrough came in 1953 when James Watson and Francis Crick proposed the double helix model of DNA. Their model explained how genetic information could be stored and replicated through complementary base pairing: adenine pairing with thymine, and cytosine pairing with guanine. This discovery laid the foundation for molecular genetics and opened pathways for revolutionary advancements in biotechnology, medicine, and forensic science. While Watson and Crick are often credited, several other scientists, including Rosalind Franklin and Maurice Wilkins, played essential roles in understanding DNA's structure. DNA is composed of nucleotide units, each consisting of a nitrogenous base, a sugar molecule called deoxyribose, and a phosphate group. These nucleotides are arranged in a specific sequence along a double-stranded helix. The backbone of the DNA molecule is formed by alternating sugar and phosphate groups, with the nitrogenous bases extending inward like rungs on a ladder. The arrangement of bases