Taaaa76
Potassium-argon

  • half-life of Potassium-40: 1 300 000 000 years

  • useful in the range from 0.5 million years and older

Uranium-lead

  • half-life of Uranium-235: 710 000 000 years

  • useful in the range from 10 million years and older

I got this from the Jacaranda textbook.

    You too! Hope we all do well

    does anyone have TSSM 2022 units 3 and 4 trial exam solutions?
    I did the exam but I don't have the solutions for it

                  https://publuu.com/flip-book/280215/655032

      i'm not sure if this works, I used an online converter

        Hey y'all I just have a couple of last-minute Biology questions haha!

        1. What extent of detail is required for the Attenuation regulation process? I've spent time in class looking at the specific leader regions (2,3 and 4) involved in the different hairpins but in some VCAA reports that level of detail isn't included (just wanted to double-check
        2. What is the last dot point all about (Migration of Aboriginals/Indigenous populations)? My class didn't actually cover this so I'm a little confused!

          do you think its ok to talk about continental drift when its about human migration eg why is there fossils of neanderthals in Australia or something like that? i remember learning about it but every time I answer a question they never talk about continental drift

          GeorgeOfTheJungle for question 2 did you mean "ways of using fossil and DNA evidence (mtDNA and whole genomes) to explain the migration
          of modern human populations around the world, including the migration of Aboriginal and
          Torres Strait Islander populations and their connection to Country and Place."?
          i think this is talking about the important place in Australia for Aboriginal and Torre Strait Islanders eg Lake Mungo as a sign of cultural evolution with the burial site and devils lair with bone points and bead artefacts

              Taaaa76
              Heyy, these are the steps I use (not 100% sure but I think they're a good starting point)

              1. DNA strands are unwound and separated into 2 singular strands by RNA polymerase
              2. RNA polymerase runs along the template strand in a 3-prime to 5-prime direction, adding complementary RNA nucleotides against the DNA strand
              3. The mRNA strand separates from the template strand and the DNA strands join back up
                EXTRA STEP (RNA processing) - The pre mRNA strand has its introns spliced out, a 5-prime Methyl cap and a 3-prime PolyA tail added

              Hope that helps you out!!

                  Taaaa76 No. the pre-mRNA strand is synthesised in a 5'-3' direction. DNA runs in an antiparallel assortment, thus to synthesise a 5'-3' pre-mRNA strand, the DNA template strand must be read in a 3'-5' direction

                    does anyone know how much detail we need to know about the steps of recombinant plasmids?

                      Taaaa76 This knowledge is not required, but it is commonly referred to as tracrRNA. It essentially anchors the gRNA to the Cas9 endonuclease.