Prepare a model of dna and presentation on it
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Molecular models of DNA structures are representations of the molecular geometry and topology of deoxyribonucleic acid (DNA) molecules using one of several means, with the aim of simplifying and presenting the essential, physical and chemical, properties of DNA molecular structures either in vivo or in vitro. These representations include closely packed spheres (CPK models) made of plastic, metal wires for skeletal models, graphic computations and animations by computers, artistic rendering. Computer molecular models also allow animations and molecular dynamics simulations that are very important for understanding how DNA functions in vivo.
The more advanced, computer-based molecular models of DNA involve molecular dynamics simulations and quantum mechanics computations of vibro-rotations, delocalized molecular orbitals (MOs), electric dipole moments, hydrogen-bonding, and so on. DNA molecular dynamics modeling involves simulating deoxyribonucleic acid (DNA) molecular geometry and topologychanges with time as a result of both intra- and inter- molecular interactions of DNA. Whereas molecular models of DNA molecules such as closely packed spheres (CPK models) made of plastic or metal wires for skeletal models are useful representations of static DNA structures, their usefulness is very limited for representing complex DNA dynamics. Computer molecular modeling allows both animations and molecular dynamics simulations that are very important to understand how DNA functions in vivo.
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i.Two long polynucleotide chains are coiled forming a right handed double helix.
ii. The two chains are antiparallel i.e., C-5' to C-3' orientations run in opposite directions.
iii. The bases of both chains are flat structures lying perpendicular to the axis; they are "stacked" on one another, 34 A(0.34 nm) apart, on the inside of the double helix.
iv. The nitrogeneous bases of opposite chains are paired as the result of the formation of hydrogen bonds.
v. Each complete turn of the helix is 34 A (3.4 nm) long.
vi. A large major groove alternating with a smaller minor groove winds along the length of the molecule.
vii. The double helix has a diameter of 20 A (2.0 nm).
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