who knowes that why light absorption in double-stranded dna is more than single-stranded dna?
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Light is absorbed by double bonds and as are more double bonds in double stranded DNA, more light is absorbed by the double bonds.\n\nThe double bonds are in the DNA bases.
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The differences between DNA/RNA:\n\n*DNA stays in the nucleus, while the mRNA leaves\n*RNA contains oxygen, while DNA doesn't (DEOXY- no oxygen)\n*DNA has the nitrogen bases Adenine, Thymine, Guanine, and Cytosine. RNA has those also, but instead of Thymine it has Uracil\n*RNA is single-stranded while DNA is double-stranded
354495
A complex question that needs a highly simplified answer.\n\nA photon of light has different energy depending on the type of light, some light does go through us, but that ight is not visible to us.\n\nX-rays for example pass through things nicely, however they can be blocked sometimes by dense material (such as bone and metal), X-rays are a higher energy than visible light.\nEven higher energy is Gamma rays... a photon of this form of light can theoretically pass through several metres of lead, sometimes more.\n\nAt the other end of the spectrum is Infra red light, which is just outside our visibilty, when you feel it, it is heat. Consider that it can be easily insulated just by putting some sort of thick barrier between you and it.\nAlpha and beta radiation are such low energy that they are actually particles (fast travelling helium, and protons respectively). an alpha particle can be blocked by a thin piece of paper. A beta particle can be blocked by your skin.\n\nNow... visible light is between the extremes of theose above. As an experiment hold a torch to the palm of your hand and you can actually see light coming through. SO some light does get through. But most of it does not.\n\nVisible light is a happy medium with just enough energy for us to see. Any more energy or any less energy in the light and life would be difficult\n\nConside that if we could only see gamma rays then we would not see much at all, because the gamma rays would not bounce off anything.\nAt the other end, if we could only see beta particles then the world would be very dark because all the beta particles would be absorbed before they reached us.
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OKay....try to make things as simple as I can for you, with all the words you provided.\n\nDouble stranded DNA is transcribed into single stranded mRNA which codes for amino acids by a process called transcription. The mRNA is then translated into polypeptide of amino acid chains. The polypeptide folds into proteins which ultimately determines the phenotype.\n\nHope it helped!
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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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Each half of the double-helix sort-of "unzips" during replication.  Since each of the bases is kind of like a jigsaw-puzzle piece, the two strands can then wind back up, if supplied with the appropriate free bases, to form two identical copies of the original DNA strand.\n\nNeat, huh?
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DNA's most amazing characteristic is that it will bind to itself in a very specific manner, forming a helix. Figure 1 illustrates two DNA molecules binding. The variable groups of the polymer interact with eachother to mediate this binding. Adenine interacts with Thymine and Cytosine interacts with Guanine. No other bonds are energetically favorable, for example Cytosine cannot bond with itself. The bonds that these variable groups form are called are called base pairs and are illustrated in Figure 2. Thus, by knowing the sequence of bases of one strand of DNA we immediately know the sequence of the DNA strand which will bind to it, this strand is called the reverse complement or just the complementary strand. In Figure 1 the right hand strand is the reverse complement of the left hand side and vice-versa.\n\n\nFrom G. S. Sent, Molecular Biology of Bacterial Viruses. Copyright 1963 by W. H. Freeman and Company\n\nFigure Two:Illustration of DNA basepairing. Thermodynamically the interactions Adenine, Guanine, Cytosine, and Thymine are driven by both the hydrophobic stacking interactions hydrogen bond interactions. The specificity of the base pairing is driven mainly by hydrogen bonding and stearic interference.\nThis relationship to the complementary strand has many implications that make life as we know it possible, and allows all sorts of molecular biology techniques. In one of the greatest understatements of all time Watson and Crick said it best in their original paper on the structure of DNA:\n\n"It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material.".
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One good one:\n\nDNA replication is much more resistant to errors ... so DNA molecules can be *much* longer than RNA and still survive replication.  This supports the stable propagation of a much larger number of genes (tens of thousands of genes) from generation to generation without degradation.
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Rosalind Franklin was a researcher at Kings College London.  Her work in x-ray photography of DNA helped advance understanding of its structure.\n\nSome of Franklin's work was shown (reportedly accidentally and innocently) to James Watson and Francis Crick.  This work may have led in some part to their Nobel Prize winning work as being the first to describe the double-helix structure of DNA. \n\nThere has been some speculation that Franklin's true contribution to DNA research in general and Watson's & Crick's success in particular was intentionally downplayed because she was a woman.
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Well, it could be both, but I would say that a viroid is more correct. \n\nAll proteins are single stranded. But the term "single stranded" is usually applied to nucleic acids, ´cause they can form double-stranded helices. \n\nSo, bearing that in mind, I´d choose viroid.
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DNA was discovered as a chemical long before the 50's when Watson and Crick discovered the structure of it.  I can't totally answer your question, but hopefully that keeps you from getting sidetracked.
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Why is it that a smart educated atheist like you doesn't know a fact of science a silly stupid christian like me knows?\nAlthough two chemical molecules may appear to have the same elements and similar properties, they can still have different structures. When two molecules appear identical and their structures differ only by being mirror images of each other, those molecules are said to have chirality. DNA develops a twist in the chain because each component contains chirality or handedness. It is this handedness that gives DNA the spiral \nshaped helical structure. If one molecule in the DNA structure had the wrong chirality, DNA would not exist in the double helix form, and DNA would not function properly. The entire replication process would be derailed like a train on bad railroad tracks. In order for DNA evolution to work, billions of molecules within our body would have to be generated with the "R" configuration all at the same time, without error. If it is impossible for one nucleotide to be formed with chirality, how much less likely would it be for billions of nucleotides to come together exactly at the same time, and all of them be formed with the same chirality? If evolution cannot provide a mechanism that forms one product with chirality, how can it explain the formation of two products of opposite chirality? Chirality is not just a major problem for evolution; it is a dilemma. According to evolution, natural processes must explain everything over long periods of time. \nHowever, the process that forms chirality cannot be explained by natural science in any amount of time. I know this isn't too deep for you because I am just a stupid theist and I understand it...\n\n\nJim
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It is not due to the chemistry of copper or gold.\n\nIt is due to the electronic band structure. The two metals unusually have a band structure that causes them to absorb light at certain frequencies rather than reflecting it.
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Space-filling model of a section of DNA moleculeDeoxyribonucleic acid (DNA) is a nucleic acid 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\nIn complex cells (eukaryotes), such as those from plants, animals, fungi and protists, most of the DNA is located in the cell nucleus. By contrast, in simpler cells (prokaryotes) such as bacteria, DNA is not separated from the cytoplasm by a nuclear envelope. The energy-generating organelles known as chloroplasts and mitochondria also carry DNA. \n\nDNA is often referred to as the molecule of heredity as it is responsible for the genetic propagation of most inherited traits. 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 DNA in mitochondria (mitochondrial DNA) only comes from the mother, and the male "Y" chromosome only comes from the father. \n\nEvery person's DNA 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 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. DNA Overview Unsolved problems in biology: Do all organisms link together to a primary source? Given a DNA sequence, what shape will the protein fold into? Given a particular desired shape, what DNA sequence will produce it? What are all the functions of the DNA? The building block of life may be a precursor to a generation of electronic devices and computers, but what are the electronic properties of DNA? Is junk DNA only molecular garbage?\nDNA Under electron microscopeThis section presents a simple (but admittedly unsophisticated) overview of DNA. \nGenes can be loosely viewed as the organism's "cookbook" or "blueprint"; \nA strand of DNA contains genes, areas that regulate genes, and areas that either have no function, or a function we do not (yet) know; \nDNA (for DeoxyriboNucleic Acid) differs from RNA by having the sugar 2-deoxyribose instead of ribose in its backbone. This is the basic chemical distinction between RNA and DNA. \nDNA is organized as two complementary strands, head-to-toe, with bonds between them that can be "unzipped" like a zipper, separating the strands; \nDNA is a chain of chemical "building blocks", called "bases", of which there are four types: these can be abbreviated A, T, C, and G, with U rarely replacing T, notably in PBS1 phage DNA; each base "pairs up" with only one other base: A+T or U, T or U+A, C+G and G+C; that is, an "A" on one strand of double-stranded DNA will "mate" properly only with a "T" or "U" on the other, complementary strand; \nBecause each strand of DNA has a directionality, the sequence order does matter: A+T is not the same as T+A, just as C+G is not the same as G+C; \nFor each given base, there is just one possible complementary base, so naming the bases on the conventionally chosen side of the strand is enough to describe the entire double-strand sequence; \nThe order of the bases along the length of the DNA is the genetic material, the sequence itself is the description for genes; \nThe cell begins DNA replication by forcibly unzipping the DNA double strand down the middle, and then recreates the "other half" of each new single strand by drowning each half in a "soup" made of the four bases. An enzyme makes a new strand by finding the correct "base" in the soup and pairing it with the or
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There is no way that Darwin could have been aware of the specific molecule we call deoxyribonucleic acid (DNA). In the mid-eighteenhundreds Friedrich Miescher isolated "nuclein" and then purified it.  The substance was identified as an acid and named as such the same century.  It wasn't until 1929 that the components of DNA were identified and 1937 that an x-ray structure of the polymer was available.  Many people worked at solving the problem (an x-ray structure of a molecule isn't a real "map" like you might think of with bones, its more like a series of clues from which you might "back out" the structure with much difficulty) and in 1953 James Watson & Francis Crick published the seminal Nature paper detailing their proposed structure for DNA, a double-helix with a phosphate backbone and nucleoside interior having set "patterns" of left-right pairing.  \n\nThis was almost 100 years after Charles Darwin published Origin of Species (1859).  Darwin's proposal of evolutionary processes stemmed from observations of the macroscopic natural world and was based not on chemistry but primarily on phylogeny.  Darwin's concepts were utilitarian-based similar to Lamarck's proposals, but differed by rejecting inheritability of aquired characteristics, instead favoring a model where beneficial intrinsic characteristics would arise on their own but predispose their bearers for greater survival & reproduction.  \n\nA contemporary with Gregor Mendel, at the time he wrote his famous Origin of Species, Darwin was not aware of the work of Mendel on inheritance of traits.  However, both scientists' work supported the same conclusions.
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A twisted ribbon is pretty a good way to describe DNA. If you imagine that each edge of the ribbon is a strand of DNA, then when you twist the ribbon you will have the characteristic double helix.\n\nIn reality, there is also a sugar/phosphate backbone which is often left out of simple models. The ribbon model also doesn't show you much about the base pairing. Still, it's a nice place to start when you are learning about nucleic acids.
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UV can affect DNA from any organism.  \n\nUV (ultraviolet) radiation is the high-energy non-visible radiation in sunlight, beyond the violet end of the visible spectrum (hence the name ultraviolet).  This high-energy radiation can knock DNA molecules out of whack ... what we call a mutation.  \n\nThe difference betwen bacteria (and other single-celled creatures) and multi-cellular creatures is that bacteria will pass this mutation on when they reproduce by division. \n\nIn multicellular organisms, this mutations in the DNA can cause uncontrolled growth of new cells, all with the same damaged DNA.  This is cancer.