the A, B and Z forms of DNA?
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A AND B ARE RIGHT HANDED DNA \nZ IS LEFT HANDED DNA\nAMONG THESE B IS MOST COMMON TYPE AND GET HYDROLYSED EASILY.
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In DNA deoxyribose-phosphate backbone and nitrogenous bases.  The bases of DNA are adenine, cytosine, guanine and thymine.  In RNA ribose-phosphate backbone and nitrogenous bases are adenine, cytosine, guanine and uracil.  A deoxyribose-phosphate backbone is essentially a pentonse sugar (5 carbons) linked to a phosphate group in a 5' to 3' direction.  The bases are connected to the 1' end of the ribose groups. Pairing occurs by hydrogen bonding between A+T, A+U, and G+C between two strands.
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Deoxyribonucleic acid (DNA) is a nucleic acid —usually in the form of a double helix— that contains the genetic instructions specifying the biological development of all cellular forms of life, and most viruses. DNA is a long polymer of nucleotides (a polynucleotide) and encodes the sequence of the amino acid residues in proteins using the genetic code, a triplet code of nucleotides.\nIn complex eukaryotic cells such as those from plants, animals, fungi and protists, most of the DNA is located in the cell nucleus. By contrast, in simpler cells called prokaryotes, including the eubacteria and archaea, DNA is not separated from the cytoplasm by a nuclear envelope. The cellular organelles known as chloroplasts and mitochondria also carry DNA.\nDNA is often referred to as the molecule of heredity as it is responsible for the genetic propagation of most inherited traits. In humans, these traits can range from hair colour to disease susceptibility. During cell division, DNA is replicated and can be transmitted to offspring during reproduction. Lineage studies can be done based on the facts that the mitochondrial DNA only comes from the mother, and the male Y chromosome only comes from the father.\nEvery person's DNA, their genome, is inherited from both parents. The mother's mitochondrial DNA together with twenty-three chromosomes from each parent combine to form the genome of a zygote, the fertilized egg. As a result, with certain exceptions such as red blood cells, most human cells contain 23 pairs of chromosomes, together with mitochondrial DNA inherited from the mother.\n\nMolecular structure:\nAlthough sometimes called "the molecule of heredity", DNA macromolecules as people typically think of them are not single molecules. Rather, they are pairs of molecules, which entwine like vines to form a double helix (see the illustration at the right).\nEach vine-like molecule is a strand of DNA: a chemically linked chain of nucleotides, each of which consists of a sugar (deoxyribose), a phosphate and one of five kinds of nucleobases ("bases"). Because DNA strands are composed of these nucleotide subunits, they are polymers.\nThe diversity of the bases means that there are five kinds of nucleotides, which are commonly referred to by the identity of their bases. These are adenine (A), thymine (T), uracil (U), cytosine (C), and guanine (G). U is rarely found in DNA except as a result of chemical degradation of C, but in some viruses, notably PBS1 phage DNA, U completely replaces the usual T in its DNA. Similarly, RNA usually contains U in place of T, but in certain RNAs such as transfer RNA, T is always found in some positions. Thus, the only true difference between DNA and RNA is the sugar, 2-deoxyribose in DNA and ribose in RNA.\nIn a DNA double helix, two polynucleotide strands can associate through the hydrophobic effect and pi stacking. Specificity of which strands stay associated is determined by complementary pairing. Each base forms hydrogen bonds readily to only one other, A to T forming two hydrogen bonds and C to G forming three hydrogen bonds. The GC content and length of each DNA molcule dictates the strength of the association; the more complementary bases exist, the stronger and longer-lasting the association characterised by the temperate required to break the hydrogen bonding, its Tm value.\nThe cell's machinery is capable of melting or disassociating a DNA double helix, and using each DNA strand as a template for synthesizing a new strand which is nearly identical to the previous strand. Errors that occur in the synthesis are known as mutations. The process known as PCR (polymerase chain reaction) mimics this process in vitro in a nonliving system.\nBecause pairing causes the nucleotide bases to face the helical axis, the sugar and phosphate groups of the nucleotides run along the outside; the two chains they form are sometimes called the "backbones" of the helix. In fact, it
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Deoxyribonucleic acid (DNA) is a nucleic acid —usually in the form of a double helix— that contains the genetic instructions specifying the biological development of all cellular forms of life, and most viruses. DNA is a long polymer of nucleotides and encodes the sequence of the amino acid residues in proteins using the genetic code, a triplet code of nucleotides\n\nhttp://en.wikipedia.org/wiki/Dna
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http://www.reference.com/browse/crystal/23235\nhttp://www.reference.com/search?q=nucleic%20acids
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NDA? DNA? Because X-ray crystalography showed it to be that shape. Read Nature vol 171 pg 964
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1. Gene transformation\n2. Junk DNA\n3. Major Histocompatibility Complex - MHC\n4. X-linked\n\nBy the way okazaki fragments are bits of DNA formed during the replication process.
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well let me think...ITS A DOUBLE HELIX!!!!!!!!!!!!\nDOUBLE          DOUBLE               DOUBLE
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DNA is made up of 3 units- \nDeoxy ribose sugar\nPhosphate\nNitrogen Base\n\nThe sugar and phospate form the backbone and the bases are attached to it at 90 degrees. Another complementary strand makes up this double helix. The bases of one strand are attached to those of the other by hydrogen bonds. \nAdenine//Thymine\nCytosine///Guanine\nThere's still a lot to describe- It's a 10 marks-question at University , you know.\n\nHey Sasha:\n"ALL OF THEM. each three purines (half steps) are called a genome and they code for one amino acid. "\n\nThe half steps, as you call them, could be either purines or pyrimidines. THEY ARE NOT CALLED A GENOME. Three nitrogen bases that code for one amino acid are called  TRIPLET CODONS. \nA genome is the whole genetic material of an organism.
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DNA has four bases, the ones you are referring to as chemicals. The names of these bases are Adenine (A), Thymine (T), Cytosine (C) and Guanine (G). In RNA all these bases are also present except T where it is replaced by Uracil (U). So when information is copied from DNA to RNA (mRNA specifically) C pairs with G, G pairs with C, T pairs with A and A pairs with U (since there is no T but U in RNA).\n\nBesides that the chemical composition of DNA (Deoxyribonucleic Acid) is a Phosphate group, a base(the four bases) and a sugar (Deoxyribose). These three parts together form a nucleotide. A nucleotide without a phosphate group is called a nucleoside. The 'chemicals' you are looking for are Adenine, Thymine, Cytosine and Guanine.
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Are you talking about Adenine, Thiamine, Cytosine, and Guanine?\nAmino Acids.
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umm, ok, i don't know what the heck the first answerer is talking about (no offense answerer). anyway, what i just learned in biology today, is that DNA is the genetic code for life. it's shape is called a double helix and it looks something like what's shown below. the two sides are made up of alternating sugar and phosphate units. To be specifc, the sugar is deoxyribose.  And then the "bars" in between are nucleotides, which are the building blocks of nucleic acids(DNA stands for Deoxyribonucleic acid). There are four types- adenine, cytosine, thymine, and guanine. the "bars" are made of two of these nucleotides paired together. adenine always pairs with thymine, and guanine always pairs with cytosine. so yeah, i hope that that helps you out. im actually just learning about all of this right now in 10th grade biology.\n\n|_____|\n|_____|\n|_____|\n|_____|\n|_____|
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short regions of dna double helix (2 nm)\n"beads-on-a-string" form of chromatin/dna and histones (11 nm)\nchromatin fiber packaged nucleosomes (30 nm)\nsection of chromosome in an extended form (300 nm)\ncondensed section of chromosome (700 nm)\nentire mitotic chromosome (1400 nm)\n\nanyway, i included a source of a diagrammatic presentation just in case... ;p\nhttp://www.accessexcellence.org/RC/VL/GG/chroma_packg.html
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its deoxyribose:  DNA is an acronym for deoxyribo-nucleic-acid\nwhereas; RNA stands for ribo-nucleic-acid, and contains ribose, instead of deoxyribose.
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1) both are nucleotide polymers\n2) contain cytosine, guanine and adenine\n3) made up of a sugar-phosphate backbone with nitrogenous bases\n4) code for biologically important information\n5) are stable\n6) capable of precise replication\n7) capable of incorporating mutations
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Nucleotide names are abbreviated into standard three- or four-letter codes. The first letter is lower case and indicates whether the Nucleotide in question is a deoxyribonucleotide (denoted by a d) or a ribonucleotide (no letter). The second letter indicates the nucleoside corresponding to the nucleobase:\n\n    G: Guanine\n    A: Adenine\n    T: Thymine\n    C: Cytosine\n    U: Uracil not present in DNA, but takes the place of Thymine in RNA\n\nThe third and fourth letters indicate the length of the attached phosphate chain (Mono-, Di-, Tri-) and the presence of a phosphate (P).
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DNA which is in the nucleas of the cell in the form of chromosomes