VCE Biology Questions Thread

Taaaa76

What is the dating period of potassium argon dating and uranium lead datin?

GreenAcorn

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.

prettypink1881

@"Taaaa76"#p16146this is from my textbook, idk what the brackets for the uranium lead one is supposed to mean though.

Uranium-235 – lead-207
dating period:1 million – 4.5 billion years (used together with U-238 – Pb-206 dating)

Potassium-40 – argon-40
dating period: 100 000 + years

GreenAcorn

prettypink1881 Oops, sorry. I didn't see you had already replied.
Best of luck to you all sitting the exam tomorrow!

Taaaa76

Thanksss

Meep<3

You too! Hope we all do well

Lemonade_222

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

Meep<3

Lemonade_222 Yes i have them. How can I send it

Meep<3

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

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

Lemonade_222

Meep<3
Thank you so muchhhh!

GeorgeOfTheJungle

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

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
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!

marine

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

marine

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

marine Yep, that's the dot point - thank you!

Taaaa76

What are the steps for transcription?

GeorgeOfTheJungle

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

DNA strands are unwound and separated into 2 singular strands by RNA polymerase
RNA polymerase runs along the template strand in a 3-prime to 5-prime direction, adding complementary RNA nucleotides against the DNA strand
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

GeorgeOfTheJungle thanks for thr summary!
Also, isnt DNA read in a 5’ to 3’ prime direction?

stevendort

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

prettypink1881

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

Taaaa76

prettypink1881 i am writing a whole essay if a question about that comes on the exam lol

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