Which came first RNA or DNA?
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I suppose it depends...\nmost cells go from DNA to RNA but retroviruses go from RNA to DNA.
430980
the first one is RNA. You can tell by the U at the end of the sequence
251724
They both have to do with RNA... I had this on a bio quiz but I forgot...\n\nMRNA: RNA transcribed from the DNA making up a gene. It transmits genetic information from the nucleus to the cytoplasm, where it directs the synthesis of proteins.\n\nTRNA: RNA molecules that carry amino acids to sites on ribosomes where proteins are synthesized.
674771
In 1869 Friedrich Miescher, a Swiss researcher, stained a cell nucleus with bromine I think, and found that something in it would stain.  He extracted this something and determined that It was composed of phosphoric acid, nitrogenated organic bases and sugar.\n\nIn 1943 Oswald Avery, a Canadian researcher found that bacteria would transform when washed, when exposed to protease, but not when exposed to deoxyribonuclease.  This led him to conclude that the something Miescher found was by composition supposed to be called deoxyrybonucleic acid and that this DNA was in fact the basic unit of heredity because doexyribonuclease is an enzyme that eats up DNA.\n\nThat's the evidence.\n\nOut genomes aren't made of RNA because that is a single stranded chain. Nothing wrong with that, but it's less sturdy than DNA, which is double stranded and supercoiled and so on.  It's a matter of what is the better means of storing your genetic information.
305731
Just a clarification-DNA is composed of nucleic acids, not amino acids.  Amino acids are the building blocks of proteins.
1124535
this is exactly why i am a creationist. i've studied microbiology and i cannot see how RNA or DNA could have invented itself.
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the bases in DNA and RNA are nitrogenous bases. they can either be pyrimidines(have 1 ring in their structure) and purines(have 2 rings in their structure).\n\nDNA\nadenine - purine\nthymine - pyrimidines\ncytosine - pyrimidines\nguanine- purines\n\nRNA\nadenine - purine\nuracil - pyrimidine\ngaunine - purine\ncytosine - pyrimidine\n\nin dna and rna the bases are complementary and form hydrogen bonds between them. the pairs are adenine and thymine in dna and in rna adenine and uracil, and in both gaunine and cytosine.\nIt is these bases that form the genetic code.
175723
While the period from the early 1900s to World War II has been considered the "golden age" of genetics, scientists still had not determined that DNA, and not protein, was the hereditary material. However, during this time a great many genetic discoveries were made and the link between genetics and evolution was made.\n\nFriedrich Meischer in 1869 isolated DNA from fish sperm and the pus of open wounds. Since it came from nuclei, Meischer named this new chemical, nuclein. Subsequently the name was changed to nucleic acid and lastly to deoxyribonucleic acid (DNA). Robert Feulgen, in 1914, discovered that fuchsin dye stained DNA. DNA was then found in the nucleus of all eukaryotic cells.\n\nDuring the 1920s, biochemist P.A. Levene analyzed the components of the DNA molecule. He found it contained four nitrogenous bases: cytosine, thymine, adenine, and guanine; deoxyribose sugar; and a phosphate group. He concluded that the basic unit (nucleotide) was composed of a base attached to a sugar and that the phosphate also attached to the sugar. He (unfortunately) also erroneously concluded that the proportions of bases were equal and that there was a tetranucleotide that was the repeating structure of the molecule. The nucleotide, however, remains as the fundemantal unit (monomer) of the nucleic acid polymer. There are four nucleotides: those with cytosine (C), those with guanine (G), those with adenine (A), and those with thymine (T).
580739
DNA is transcribed into RNA (the so called messenger RNA, mRNA, to be exact). Like almost every other biochemical process, it is made possible by enzymes - in this case RNA-polymerases (we have three types, bacteria only one). It is able to "read" the template - being DNA - and use free nucleotides - the building blocks of nucleic acids - to create a complementary copy of RNA. DNA is a double stranded molecule (the famous double helix), mRNA has a single strand. This process takes place in the cell nucleus.
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because,DNA is the genetic material of all living organism.it has been proved by hershey chase experiment and griffit experiment.central dogma of body goes with the replication of DNA followed by transcription.then goes for translation in order to produce proteins.even though the difference between DNA of one person to another person is less than 1%,it really makes sense in the way of making difference in humans in their behaviour, taste, character, appearance n many others. from that, it is and the only truely blue print for all life.\nDifferences:\nDNA - deoxyribo nucleic acid\nRNA - ribo nucleic acid\nthey are different in their nitrogenous bases,DNA has adenine,guanine,cytosine and thymine but RNA has all but uracil instead of thymine.\nbcoz,of this, they differ in their functions.\n\nsimilarities:\nstructurally both are simililar.\nboth are nucleic acids
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B) RNA is found only inside the nucleus, whereas DNA is found only outside the nucleus.\n\nIn order for the statement to be true, the subjects (RNA & DNA) should be switched.
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RNA is significantly less stable than DNA.  Both in terms of overall structural integrity, and its succeptability to mutation.\n\nThere is a rather large gain of fitness by having DNA storage of information instead of RNA.  After a few billion years that's why we are where we are.\n\nA few things (RNA viruses) continue to utilize RNA as their genetic material, but their success is due to the very lack of stability that makes an RNA-based genetic system a bad idea for "living" organisms.
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RNA is the one also found in the cytoplasm.
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mRNA:\n\nRNA that serves as a template for protein synthesis\n\nDNA:\n\nThe material inside the nucleus of cells that carries genetic information. The scientific name for DNA is deoxyribonucleic acid.
454638
Weird question.\nDNA is what's life made of, It is a chemichal compound (nuclic acid) in the form of a double helix which has the unique ability of dividing  where each devided branch can form a new mollecule. It is the first living chemichal out of which all life evolved. It is composed of 4 groups of amino acids Citozin-Guanin-Thiamin-Adenin(spelling?)\nin short, it is the building blocks of life, DNA and RNA (Deoxy ribonuclic acid and ribonuclic acid) are the building blocks of life. Understanding their role is the key to understand heriditary, genetics and evolution.
435654
DNA has the original code (for proteins) and RNA is the copy(of DNA) that leaves from the nucleus. Because DNA can't leave the nucleus so RNA copies the "code" from DNA.
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there sugar groups\n\nDNA had no oxygen on carbon 2 so Deoxyribose\n\nand RNA does have an oxygen on carbon two Ribose\n\nanything with 'ose' denotes a sugar for example glucose fructose