Dna Structure
Dna Structure - Related Videos
09:31
Amplification, Next-generation Sequencing, and Genomic DNA Mapping of Retroviral Integration Sites
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Cited by 56 •
2016
We describe a protocol for amplifying retroviral integration sites from the genomic DNA of infected cells, sequencing the amplified virus-host junctions, and then mapping these sequences to a reference genome. We also describe techniques to quantify the distribution of integration sites relative to various genomic annotations using BEDTools.
07:59
Preparation of Nucleosome Core Particles Complexed with DNA Repair Factors for Cryo-Electron Microscopy Structural Determination
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2022
This protocol outlines in detail the preparation of nucleosomal complexes using two methods of sample preparation for freezing TEM grids.
02:56
Cell Structure - Concepts
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2019
Background Cells represent the most basic biological units of all organisms, whether it be simple, single-celled organisms like bacteria, or large, multicellular organisms like elephants and giant redwood trees. In the mid 19th century, the Cell Theory was proposed to define a cell, which states: Every living organism is made up of one or more cells. The cells are the functional units of all organisms. All cells arise from preexisting cells. All cells share common features such as having a...
00:55
DNA Helicases
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2020
DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
00:56
Viral Structure
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2019
Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid. Structural Classes of Viruses Many criteria are used to classify viruses, including capsid design. Most viruses...
FAQs
The antiparallel arrangement places the two DNA strands in opposite orientations, allowing complementary bases to align within the double helix. This organization is important because each strand can serve as a reference for the other when genetic material is copied. It therefore connects three-dimensional molecular organization with reliable transmission of hereditary information across cell divisions.
Complementary base pairing gives each DNA strand a matching sequence pattern that can guide the formation of a corresponding strand. Adenine pairs with thymine, while cytosine pairs with guanine, preserving the information encoded in the original molecule. This relationship explains why DNA structure supports accurate replication and helps maintain genetic information during cell division.
Sugar-phosphate backbones form the continuous structural framework of each DNA strand, while the bases project inward and pair across the double helix. Their arrangement separates the strand framework from the information-bearing base sequence. This organization helps explain how one molecule can combine a stable molecular architecture with a coded pattern used in heredity and gene expression.
The molecular organization of DNA provides the physical context in which genetic information is maintained and used. Its paired strands preserve complementary sequence information, while the arrangement of nucleotides carries the underlying genetic code. Consequently, studying DNA structure helps biology connect the storage of hereditary information with gene expression and the traits associated with genetic material.
DNA structure gives researchers a framework for examining changes in the molecule’s genetic information and considering how those changes relate to inherited characteristics. Because DNA stores and transmits hereditary information, structural analysis can connect observed sequence differences with investigations of mutations and genetic disorders. This makes molecular organization relevant to both basic biology and disease-focused research.
Knowledge of DNA structure provides a foundation for molecular techniques that analyze genetic material, including sequencing and polymerase chain reaction. Complementary strands and defined base-pairing rules give these approaches a molecular framework for examining DNA information. Understanding that framework helps researchers interpret results and apply these techniques to questions involving heredity, mutations, and gene-related biology.
DNA structure is central to biotechnology because it explains how genetic information is organized, preserved, and examined as a molecular material. The double-stranded arrangement and complementary bases provide concepts for analyzing DNA in recombinant DNA studies. As a result, structural knowledge supports broader investigations into genetic information, biological inheritance, and the use of molecular methods in research.