• Scipitie@lemmy.dbzer0.com
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    5 days ago

    The"single cell pet" gets me even more… Like isn’t that a tad specific? Dogs? No prob! Rabbits? Be my guest. Amoeba? Fuck off, weirdo!

  • janNatan@lemmy.ml
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    5 days ago

    Wait wait. What would happen if a long half-strand of DNA tried to pair with another but there was one letter wrong in the middle?

    • IrritableOcelot@beehaw.org
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      5 days ago

      Something called a “lesion” around a base mismatch, basically a bubble in the strand pairing. It can introduce kinks in the helix, and generally is the result of mutation in one strand.

    • PapaStevesy@lemmy.world
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      5 days ago

      If that’s how DNA worked, I imagine it just wouldn’t pair, but that’s not how DNA works. However there can be and are many mistakes in the transcription and translation of genes, they’re called mutations and they’re the mechanical cause of cancer. The kind of spontaneous mutation your imagining is unlikely to lead to cancer without other contributing factors, and the body has numerous control and correction mecahnisms, but there are billions of base pairs (i.e. A—T is one base pair) in each cell of the body getting transcribed and translated over and over and over, so quite a few mistakes get through.

      • weed_scientist@mander.xyz
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        1 hour ago

        It is how DNA works in the case of PCR, for example. The denaturation cycle splits double stranded DNA into individual single strands, which can be thousands of base pairs long. Primers are short sequences that bind to these single strands. If there are only one or two mismatches, the primer can easily bind to the wrong part of the DNA strand, if the temperature during the annealing step is low enough. This causes messy gels and incorrect DNA products in the PCR.

        In some cases, if the temperature is very low, the primer can bind to sequences with many mismatches. This results in the scientist crying and finding god.

    • IrritableOcelot@beehaw.org
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      5 days ago

      Nope. RNA is chemically different: different sugar in the backbone, and there are wayyyy more than 4 RNA bases (like 12 iirc)

      • nis@feddit.dk
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        4 days ago

        Nice. I learned something new today 🙂

        Not sure where I picked up my belief that RNA was just one side of DNA.

    • DragonsInARoom@lemmy.world
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      5 days ago

      Yes, some viruses are single strand RNA (+ssRNA or -ssRNA) the textbook Microbiology: with Diseases by Taxonomy by Robert W Bauman is a good reference with a section for both. (Does have sqeemish pictures though.) (And its on zlib.)