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dna biology definition

DNA sequencing is the process of determining the sequence of nucleotides within a DNA molecule.Every organism’s DNA consists of a unique sequence of nucleotides. This complex on DNA wrapped around a histone is called a nucleosome. Determining the sequence can help scientists compare DNA between organisms, which can help show how the organisms are related. DNAin Eukaryotic DNA. DNA Sequencing Definition. • specific base pairing. Learn more. Activities Take a ten question quiz about this page. The DNA is stored as chromosomes inside of the chromosomes. DNA synonyms, DNA pronunciation, DNA translation, English dictionary definition of DNA. DNA Replication DNA replication is the first step in both mitosis and meiosis. In biology, parts of the DNA double helix that need to separate easily, such as the TATAAT Pribnow box in some promoters, tend to have a high AT content, making the strands easier to pull apart. There are DNA polymerases and RNA polymerases. Other proteins are also involved for initiation of the process and copying of DNA, along with proofreading capabilities to ensure the replication process takes place accurately. DNA was first isolated and identified by Swiss biologist Friedrich Meischer in 1869. DNA is necessary for the production of proteins, the regulation, metabolism, and reproduction of the cell. More Biology Subjects. Chromosomes in eukaryotic cells are linear in shape. In order to tightly coil the DNA to fit in the nucleus as chromosomes, the DNA is tightly wound around proteins called histones. DNA polymerases are those that are involved in template-directed synthesis of DNA from deoxyribonucleotide triphosphates. • two sugar-phosphate backbones held together by hydrogen bonds between base pairs. Definition noun, plural: DNA polymerases (molecular biology) An enzyme assisting in DNA replication Supplement Polymerases are enzymes that assist in synthesizing long chains of nucleic acids. DNA Definition Deoxyribonucleic acid, or DNA, is a biological macromolecule that carries hereditary information in many organisms. DNA replication process uses DNA polymerase as the main enzyme for catalyzing the joining of deoxyribonucleoside 5′-triphosphates (dNTPs) forming a growing chain of DNA. A Level: Biology. Structure of DNA The double-helix structure of DNA, enabling it to act as a stable information-carrying molecule, in terms of • the components of DNA nucleotides: deoxyribose, phosphate and the bases adenine, cytosine, guanine and thymine. In the laboratory, the strength of this interaction can be measured by finding the temperature necessary to break half of the hydrogen bonds, their melting temperature (also called T m value). DNA definition: 1. deoxyribonucleic acid: the chemical, present at the centre of the cells of living things, that….

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