DNA - Wikipedia
Deoxyribonucleic acid (/ diːˈɒksɪˌraɪboʊnjuːˌkliːɪk, - ˌkleɪ -/ ⓘ; [ 1 ]DNA) is a polymer composed of two polynucleotide chains that coil around each other to form a double helix. The polymer carries genetic instructions for the development, functioning, growth and reproduction of all known organisms and many viruses.
The Structure and Function of DNA - Molecular Biology of the …
A DNA molecule consists of two long polynucleotide chains composed of four types of nucleotide subunits. Each of these chains is known as a DNA chain, or a DNA strand. Hydrogen bonds between the base portions of the nucleotides hold the two chains together (Figure 4-3).
7.1: DNA Structure - Biology LibreTexts
Dec 30, 2022 · Deoxyribonucleic acid is a polymer chain of nucleotides connected by 5’ to 3’ phosphodiester bonds. DNA normally exists as a two antiparallel complementary strands held together by hydrogen bonds between adenines (A) and thymines (T), and between guanines (G) and cytosines (C).
DNA | Definition, Discovery, Function, Bases, Facts, & Structure ...
Nov 8, 2024 · Each strand of a DNA molecule is composed of a long chain of monomer nucleotides. The nucleotides of DNA consist of a deoxyribose sugar molecule to which is attached a phosphate group and one of four nitrogenous bases: two purines (adenine and guanine) and two pyrimidines (cytosine and thymine).
DNA Is a Structure That Encodes Biological Information
There are four different DNA nucleotides, each defined by a specific nitrogenous base: adenine (often abbreviated "A" in science writing), thymine (abbreviated "T"), guanine (abbreviated "G"),...
DNA Structure - Biology Dictionary
Jan 21, 2021 · DNA (deoxyribonucleic acid) molecules are nucleic acids, which are the information-carrying molecules of the cell. DNA molecules are polymers and are made up of many smaller molecules, called nucleotides. Each nucleotide contains a phosphate group, a sugar molecule, and a nitrogenous base.
The structure of DNA
Oct 9, 2019 · On 25 April 1953, James Watson and Francis Crick announced 1 in Nature that they “wish to suggest” a structure for DNA. In an article of just over a page, with one diagram (Fig. 1), they...
Discovery of DNA Structure and Function: Watson and Crick
Without the scientific foundation provided by these pioneers, Watson and Crick may never have reached their groundbreaking conclusion of 1953: that the DNA molecule exists in the form of a...
The Structure of DNA | by Ron Vale - explorebiology.org
DNA (deoxyribose nucleic acid), discovered in 1869 by Friedrich Miescher, is composed of four bases (guanine, cytosine, adenine, thymine). The bases are connected to a sugar (deoxyribose), and sugars are interconnected through phosphate linkages to form a long, unbranched chain.
explain the structural basis for the directionality of polynucleotide chains. describe how hydrogen bonding and geometry dictate base pairing. describe the forces that stabilize the DNA double helix. explain the significance of the grooves in the DNA double helix. describe how DNA is compacted into chromosomes.