Biology Question "DNA"?
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No other information need be given.\n\nThe diagram represents a "untwisted" double helix.  The top row is a series of nitrogen bases, and the bottom row would be it's complimentary half.  The question is asking you which nitrogen base is paired with or across the ladder from Guanine in DNA. \n\nGuanine is a purine, and purines only bond with pyrimidines.  Since Adenine is also a purine, that is the incorrect answer.  Cytosine, thymine and uracil are pyrimidines.  Uracil is only found in RNA, so since the question specifies DNA, Uracil is incorrect.  That leaves us cytosine and thymine.  \n\nThe correct answer is (C) cytosine.  Guanine and cytosine are held together through three hydrogen bonds.  Adenine and thymine (or uracil in RNA) are joined by only two hydrogen bonds.  The molecules do not line up properly between guanine and thymine to form a bond.
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dna and genetic coding of chromosomes.
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Just a clarification-DNA is composed of nucleic acids, not amino acids.  Amino acids are the building blocks of proteins.
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Generally there are different types of DNA(A,B,Z ,e.c.t)\nBut DNA occure in different shapes thats because of Major and Minor grooves of the DNA
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DNA=Deoxy Ribon Nucleic Acid.\n\nits the material in a nuclei i n a nucleus, in acell that stores the cells information.\n\n~LG23~
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what type of image what type of DNA?\n\n\nhttp://www.csulb.edu/~cohlberg/storage/dna302.jpg\nhttp://www.alzheimers.org/rmedia/IMAGES/high/DNA_HIGH.JPG\nhttp://www.altered-states.net/barry/newsletter205/dna.jpg\nhttp://cmgm.stanford.edu/biochem201/Slides/DNA%20Topoisomerase/122%20Hum%20Topo%20I%20-%20DNA%20%20sites.JPG\nhttp://www.cottonexpressions.com/images/DNA.Large.jpg\nhttp://www.foolishpeople.com/foolishpeople/images/gem-dna.jpg\nhttp://www.ks.uiuc.edu/Research/vmd/images/collections/dof/dna/dna.jpg\nhttp://cmgm.stanford.edu/biochem118/images/DNA%20Slides/10A-DNA.jpg
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DNA- deoxyribonucleic acid\nwhere the genes is made of. \nthe histones is the protein that pack DNA together to form chromosome!
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http://www.bbc.co.uk/dna/h2g2/A1087193\n\n\nthis should answer all your questions, hope it helps
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Usually described as about 2 meters for all of the dna in one human cell.  This actually consists of many separate strands of dna.
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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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25,000\n\n\nTypical numbers of genes in an organism\n\nThe following table gives typical numbers of genes and genome size for some organisms. Estimates of the number of genes in an organism are somewhat controversial because they depend on the discovery of genes, and no techniques currently exist to prove that a DNA sequence contains no gene. (In early genetics, genes could be identified only if there were mutations, or alleles.) Nonetheless, estimates are made based on current knowledge.\n\n\norganism genes base pairs\nPlant <50,000 <1011\nHuman, mouse or rat 25,000 3×109\nFruit Fly 13,767 1.3×108\nHoney bee 15,000 3×108\nWorm 19,000 9.7×107\nFungus 6,000 1.3×107\nBacterium 500–6,000 5×105–107\nMycoplasma genitalium 500 580,000\nDNA virus 10–900 5,000–800,000\nRNA virus 1–25 1,000–23,000\nViroid 0–1 ~500
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DeoxyriboNucleic Acid
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You've probably heard the fact that our DNA is 98% the same as that of a monkey, what many people don't know is that our DNA is also about 80% the same as that of a fruit fly. Dog DNA probably comes in somewhere in between. I don't think anyone has ever done a study on that though.
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One word contradicts your "facts". \n\nPlasmids.\n\nPlasmids are non-chromosomal loops of DNA found in bacteria.  They often contain antibacterial resistance genes, or give the ability to use different sugars.  These plasmids are commonly shared by bacteria.  This is a gain of genetic information.\n\nNow, it is true that we only have 4 types of nucleotides in DNA, and they make about 20 amino acids.  This is conserved in all life forms. But from this, a countless number of proteins can be made, and have a nearly infinite number of effects.  Your suggesting could be likened to saying that we can never invent a new word, since we only have 26 letters.  \n\nPlease provide a source for your claims, perhaps then we can understand how you arrived at such a conclusion.
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DNA which is in the nucleas of the cell in the form of chromosomes
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Deoxyribonucleic acid (DNA) is a nucleic acid that contains the genetic instructions for the biological development of a cellular form of life or a virus. All known cellular life and some viruses have DNAs. DNA is a long polymer of nucleotides (a polynucleotide) that encodes the sequence of amino acid residues in proteins, using the genetic code.\nDNA is responsible for the genetic propagation of most inherited traits. In humans, these traits range from hair color to disease susceptibility. The genetic information encoded by an organism's DNA is called its genome. During cell division, DNA is replicated, and during reproduction is transmitted to offspring.\n\nIn eukaryotic cells, such as those of plants, animals, fungi and protists, most of the DNA is located in the cell nucleus, and each DNA molecule is usually packed into a chromosome that are passed to daughter cells during cell division. By contrast, in simpler cells called prokaryotes, including the eubacteria and archaea, DNA is found directly in the cytoplasm (not separated by a nuclear envelope) and is circular. The cellular organelles known as chloroplasts and mitochondria also carry DNA. DNA is thought to have originated approximately 3.5 to 4.6 billion years ago.[1]\n\nIn humans, the mother's mitochondrial DNA together with 23 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. Lineage studies can be done because mitochondrial DNA only comes from the mother, and the Y chromosome only comes from the father
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DNA\nDeoxyribose - The sugar that makes up the sugar-phosphate backbone of the DNA\nNucleic - Because it was originally thought only to be found in the nucleus.  We now know that some viruses and Prokaryotes have DNA but do not have a nucleus\nAcid - Because the weak hydrogen bonds keeping the organic bases in place mean that it is acidic