Dna Definition and 398 Threads

  1. H

    Is DNA Animation Truly Real-Time?

    Nicely done. Supercomputer? They say the animation is real time but wouldn't the real thing be much quicker?
  2. H

    Looking For Today's DNA Knowledge

    I got my biology degree in 1979 and would like to get current again on DNA. What would you suggest? I'm in Japan so access to English books is quite limited.
  3. Queenie

    DNA-maternity test - could you see other relationship than mother?

    Hi, I have e hypothetical question. (I'm a thriller author and am stuck on my knowlegde on DNA). I've tried to google this for a few days now, but I guess I'm doing it wrong. So let's say a newborn is found by a couple on their porch. It's not theirs and not their daughter's so they take it to...
  4. S

    Could human DNA be every type of plant, animal, or microbe DNA?

    I'm asking in order to understand if the only difference between the DNA of all living things is merely the arrangement or sequence of their letters. This is more of a curiosity question, not about sci-fi or current feasibility. Could the letters of a human DNA be reordered so it's identical to...
  5. G

    Calculating Shannon Entropy of DNA Sequences

    Unfortunately, I have problems with the following task For task 1, I proceeded as follows. Since the four bases have the same probability, this is ##P=\frac{1}{4}## I then simply used this probability in the formula for the Shannon entropy...
  6. G

    Micro Spring (DNA): Determine Energies, Find Expected Length

    Hi It is about a DNA strand on which there are always two segments, the segment ##A##, which is folded and has the length ##l_A## and the unfolded segment ##B##, which has ##l_B+\lambda##. Here is a section of the DNA There is now, as shown in the picture, a force ##F## pulling on the...
  7. DaveC426913

    Valid Shapes of DNA: Is A Reasonable?

    I'm designing a ... let's call it a sculpture. It represents DNA. I just realized there are (at least) two ways helices can spiral together: A has two helices that are concentric but with different radii. They are also "in phase". B has two identical helices that are "out-of-phase" by 180...
  8. K

    Genetic code other than DNA (moved)

    Summary: Curious to find out genetic code other than DNA <mentor> Moved to Discussion, hypothetical discussion Dear PF Forum, It's been a long time since I log into PF. And I hope everybody is in a good health. Recently I had a discussion debate with my friend about other life in this...
  9. nomadreid

    Why does the DNA codon ACG code for threonine in the RNA codon table?

    I refer to the tables on https://en.wikipedia.org/wiki/DNA_and_RNA_codon_tables In both the DNA and the RNA codon tables, ACG codes for threonine. But the transcription of the ACG from the DNA to the mRNA ends up with UGC (which would code for Cysteine). So should I assume that when the DNA...
  10. samy4408

    Are Minor Bases and Nucleosides the Same Thing

    Hello , is minor bases and Nucleoside the same thing ?
  11. Astronuc

    What insights can ancient DNA provide about human ancestry?

    I recently took a DNA test in parallel with collecting family records, government records, and church records (many of which are used by local/regional governments). I knew about many ancestors, but I've confirmed many more through discovering other family lines through DNA tests. I've...
  12. moriah

    Unpacking the Complexity of Human DNA

    What is in our DNA that separates us from other primates?
  13. mktsgm

    Medical What determines the long-term effectiveness of a viral vaccine?

    It is well known that RNA viruses mutate very quickly. Hence, it is said that it is very hard to develop an effective vaccine against it. With HIV and influenza RNA viruses the scientific world is still facing difficulty in developing effective long-term vaccines against them. Most influenza...
  14. I

    Biology Gel Electrophoresis of DNA fragments produced by apoptosis

    The answer is that there would only be a 250 bp fragment, and it would be brighter. I think that there would just more fragments of all sizes, as more DNA is degraded. I don't understand why there wouldn't be fragments of larger sizes. Thanks!
  15. mktsgm

    Can the AstraZeneca vaccine be called also as a DNA vaccine?

    In my understanding, in the human host, the Oxford–AstraZeneca vaccine delivers the DNA genetic code for the production of spike proteins of the SARS-CoV2 virus, inside a vector virus. DNA vaccines deliver them through plasmids. Apart from this delivery mode, is there any difference between the...
  16. Moara

    Conditional probability and criminal DNA analysis

    We know that ##P(A-) = (95\% \cdot 0.5\% + 5\% \cdot 98.5\% )## and ##P(guilty \ and \ A-) = (95\% \cdot 0.5\%)##, so letter a) is just ##P(guilty \ and \ A-)/P(A-)##. What I tried to do in letter b) was again using the conditional probability theorem. First calculating the probability that...
  17. C

    Buffer solution working with DNA -- I have to dissolve dried oligos in PBS

    This is the first time I am working with DNA and I have to dissolve the dried oligos in PBS( 10mM phosphate buffer, 100mM NaCl, ph=7.4) buffer. However I don't understand how to do that. I will really appreciate if somebody can please explain me. Thank you in advance.
  18. jedishrfu

    COVID Resistance from Neanderthal DNA

    https://www.cnn.com/2021/02/16/health/neanderthal-gene-coronavirus-scn-wellness/
  19. H

    Biology Prokaryote DNA replication subunits

    Why (A) and (B) need to break phosphoanhydride bonds? Thanks
  20. C

    Did your DNA test results change when using a second company to do the test?

    Here's the story: I did the 23&Me and it told me that I was about 90% X but then there was among the smaller %ages a Y = French Later, about a year later, I checked it again. The French ancestry had disappeared. There was still 90% X, but now I had a Y = Scandinavia. So, I ran the test again...
  21. entropy1

    Recombining DNA in reproduction

    I understand that DNA strands have two sides with amino acids, and that the amino acids connect to each other by being the opposite of each other (A-T, C-G). I also understand that the reproductory DNA of the organisms reproducing each consist of one side of each of the DNA strands, that...
  22. A

    DNA sequencing and restoring malformed sequences

    I was just reading about DNA sequencing. In my view, DNA can be modeled into an ordered sequence of nucleobases, as if the two strands were joined into a single strand (just like in RNA). The first half of the sequence models the first strand. The four nucleobases are numbered from 0 to 3...
  23. J

    Does DNA get affected by the concentration of the liquids around it?

    Hi I would just like to know if DNA is affected by the concentration of liquids around it. Thanks and best regards,
  24. A

    Cumulative DNA damage in active vs. less active neurons?

    Hi all, In light of recent findings about Topoisomerase-mediated DNA double strand breaks, I have been looking for a study out there that compares cummulative DNA damage in active neurons vs. less active counterparts. So far I have not been able to find anything - this would hopefully be over a...
  25. pinball1970

    Salmon parasite has no mitochondrial DNA

    This was published in Feb https://www.pnas.org/content/117/10/5358 The genes relating to mitochondria in this parasite of Salmon are absent which is a first to see in a multi cellular animal.
  26. T

    Questions about DNA, biology, genetics and genealogy tests

    Is there any DNA, biology, genetics and genealogy tests that i can take to find out what i am supposed to do naturally OR what I am naturally made for? for example, my sexuality or being straight, bisexual, gay. If yes, what do these tests tell me about my DNA, biology and/or genes? Even if its...
  27. BillTre

    Preserved Dinosaur Cartilage: Proteins, Chromosomes and DNA Markers

    I found this article on https://www.researchgate.net/publication/339566392_Evidence_of_proteins_chromosomes_and_chemical_markers_of_DNA_in_exceptionally_preserved_dinosaur_cartilage. The reference is: Alida M. Bailleul, Wenxia Zheng, John R. Horner , Brian K. Hall, Casey M. Holliday and Mary H...
  28. A

    Fossil origin based on DNA testing

    I often read that whenever a new fossil is found (like a bone fragment or skull fragment etc) they trace it back to either some animal or human , now mostly (and before DNA testing was possible) this was done I suppose by visual inspection and "radiocarbon" dating to put the fossil in a...
  29. G

    Can DNA Computers Revolutionize Computing Technology?

    Scientists Build Tiny Computer From DNABy Patricia ReaneyLONDON (Reuters) - Following Mother Nature's lead, Israeli scientists have built a DNA computer so tiny that a trillion of them could fit in a test tube and perform a billion operations per second with 99.8 percent accuracy.Instead of...
  30. G

    Are DNA Computers Limited by Their Biological Nature?

    I gained an interest in DNA Computers, and after reading how they would work i feel that there would be some limitations to the system that could be breached to gain greater power.Mainly, its written on the internet that the DNA would be integrated into a computer chip to create a biochip...
  31. A

    Is RNA or DNA Involved in Cell Wall Formation?

    Is RNA or DNA "read" to create cell walls, or all all cell walls produced through mitosis? Even, so, material must be added to to make the cell as large as the parent, right? How is this accomplished?-----------------------------------------------------Two wrongs don't make a right.
  32. T

    Has it been 50 years since Watson and Crick unveiled the DNA double helix?

    It has been 50 years since Watson and Crick discovered that DNA was double helix.Turtle
  33. K

    What Are the Implications of Neanderthal DNA Findings for Human Evolution?

    I apologize if this has been covered, I didn't find it in a search through the last 30 days (I time out doing larger searches!)I'm curious what people think the implications of this find are? (without too much speculation)Multiple humanlike races? the possiblity of more then one instance of...
  34. T

    What Impact Did Watson and Crick's DNA Discovery Have 50 Years Later?

    It has been 50 years since Watson and Crick discovered that DNA was double helix.Turtle
  35. S

    Who Were the Key Figures in the Discovery of DNA Structure?

    We are currently studying genetics in my biology class at school. For a couple days we watched a movie entilted, "Race for the Double Helix" (i think). My teacher said it was on A&E a while ago.Anyway, in the movie they mention these people/things:Linus PaulingRosaling FranklinErwin...
  36. A

    Are There Parts of DNA That Cannot Change?

    I have 2 questions about DNA:1) Are there parts of DNA that are unchangeable?2) If so, what is the difference between the unchangeable and changeable DNA that accounts for this?-----------------------------------------------------Just consider me a violent Gandhi.
  37. T

    Did Nuclear Fallout Cause DNA Mutations in Reproductive Cells?

    Strange but true..I was really surprised when I heard that the nuclear fall out of Chernobyl and the bombing of Hiroshima didn't affect the DNA in the germline (reproductive) cells.. Studies showed that they couldn't see a major difference between the DNA of children concieved before and after...
  38. L

    Did invasive viruses shape our DNA and cellular structures?

    Some say that the majority of our DNA comes from genetic material of past invasive viruses, and that cells' structures today (like mitochondria, chloroplasts, and ribosomes) originated as bacteria that fused through an ancestral cell's membrane. Do you have any other examples for or against...
  39. T

    What mechanisms contribute to the chemical degradation of DNA?

    Does anyone know any mechanisms for that? ss or dsDNA is the template.What about freezing-thawing, how does that affect DNA?I am puzzled, we are working with short fragments of ssDNA (between 500 nt to 1000 nt probably) and they seem to degrade within weeks! Very frustrating since the samples...
  40. E

    Can Computers Simulate Life Like Our DNA?

    In men, our daily functions are controlled by our genes, dna, etc...in computors, they are controlled by the binary code...the DNA for earth based life forms have 4 bases, T, A, G and Cthe binary code for computors are made up of 1 and 0isnt this very similar? life only have two more extra bases...
  41. I

    Saving Viral DNA: B Cell Mechanisms

    Hello, I am not sure if this an odd or even an ignorant question or not, but I will give it a try. I understand that the adaptive immune system "saves viral DNA" as antibodies to potentially "use" it in the future, if the antigens ever "return". I also understand that "antigens" are "virus...
  42. Ygggdrasil

    New CRISPR-based tool for find-and-replace editing of DNA

    Over the past half decade, researchers have envisioned the https://www.physicsforums.com/insights/dont-fear-https://www.physicsforums.com/insights/dont-fear-crispr-new-gene-editing-technologies-wont-lead-designer-babies/-new-gene-editing-technologies-wont-lead-designer-babies/system as a way to...
  43. jim mcnamara

    GrimAge: methlyation DNA change, mortality

    Popular precis: https://www.aging-us.com/dna-methylation-grimage-strongly-predicts-lifespan-and-healthspan Ake Lu, Steve Horvath David Geffen School of Medicine at UCLA My take: While DNA may change anywhere due to methylation, so that cells in a given tissue may have different damage points...
  44. jedishrfu

    DNA is Held Together by a Watery Environment

    https://scitechdaily.com/scientists-were-wrong-about-dna-it-is-actually-held-together-by-hydrophobic-forces/
  45. enorbet

    Medical DNA of Gut Bacteria Scores Hits in Autism?

    Greetings Since genome sequencing is apparently having a major impact on medical science, just to name one field, I am interested in hearing/reading more about this recent event regarding autism. It seems to me this could have far-reaching implications and possibly major impact on how we view...
  46. BillTre

    Medical "Ethics and Liabilities of Medical DNA Sequencing" -- Symposium

    As DNA sequence information from individual patients becomes more available, and the amount of information associated with particular sequence variants increases, this kind of collection and analysis of sequence data will assume great importance to medical practitioners. With medical importance...
  47. jedishrfu

    Medical The at-home DNA test craze is putting us all at risk

    Interesting video on DNA and privacy in today's world: Specifically folks in some instances can be identified from their relatives DNA. The worry of course is false positives placing you at a crime scene or of a sketchy insurance company profiling you and refusing coverage based on what...
  48. Ygggdrasil

    Researchers double the size of the DNA alphabet

    Published this week in the journal Science, researchers report that they have devised a eight letter alphabet for DNA and RNA: The work builds off of previous work, which had expanded the genetic alphabet to six letters. The researchers call their eight-lettered nucleic acids "hachimoji,"...
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