Post Exam Discussion

[The Peasant]

im probably wrong dw

what did you guys write for that radioactive dating question 1:1 ratio?

1.25 billion years. (since only one half life occured)

edit* million years or what ever it was lol

[grindr]

im probably wrong dw

what did you guys write for that radioactive dating question 1:1 ratio?

I said 1.25 billion yrs

[Gromekk]

yeah it should be 1.25 billion

Edit: just answering some other questions, i wrote that humans migrated through the middle east and east asia to australia, and for the timing i wrote that they likely passed east asia around 60,000 years ago

The linked genes questions i felt pretty confident on, a question on linked genes was on one of the past exams so i studied it a bit

[Individu]

This is pretty much what I did for the first part (or something like that). I don't really remember the rest of the question though.

I thought they just asked for the genotypes of the gametes.. Like, you just write in BR, br etc. - not the entire chromosome?

[Gromekk]

I thought they just asked for the genotypes of the gametes.. Like, you just write in BR, br etc. - not the entire chromosome?

Yep that should be right, in the box right? on the next page the answer was the middle one with Br/bR

[The Peasant]

I thought they just asked for the genotypes of the gametes.. Like, you just write in BR, br etc. - not the entire chromosome?

Yeah, asked for genotypes of gametes only. And yeah, it was the middle one that was circled.

[Gromekk]

so in the first short answer question how did the aggregates cause cell death, looking back now i think it might've had something to do with the spiky bits piercing cells or something but i wrote something about inhibiting enzymes

[lmnop]

Yep that should be right, in the box right? on the next page the answer was the middle one with Br/bR

Dammit....yeah it was the question with the boxes.
I did circle Br/bR so hopefully my justification is sound enough.
For the amino acid question, did you guys include Met (or something like that) as part of your answer?
I ask because the next question regarding the position of the fifth amino acid tripped me up quite a bit

[cosine]

Dammit....yeah it was the question with the boxes.
I did circle Br/bR so hopefully my justification is sound enough.
For the amino acid question, did you guys include Met (or something like that) as part of your answer?

i think i had 8 amino acids?

and for the cell death question, i said because the cell membrane is pierced, there will be no regulation of sodium and potassium ions in/out of the neurones, and so there will be also no action potentials too which will cause them to die? idk..

for the mutation, i said switch I think it was A with C so that a stop codon would be produced and only five triplets were coded for?

[Gromekk]

For the amino acid question, did you guys include Met (or something like that) as part of your answer?

do you mean the one where a mutation causes the chain to shorten? Yeah include met or whatever and i think it ended up being 7 amino acids long in the first part. cant remember exactly

Edit: yeah it couldve been 8, something along those lines

[The Peasant]

so in the first short answer question how did the aggregates cause cell death, looking back now i think it might've had something to do with the spiky bits piercing cells or something but i wrote something about inhibiting enzymes

Yeah, I though it was a question asking about the structure, so I wrote something wrong for that aswell. Should've been something like: "The star shape structure enable the amyloid beta protein to pierce the membrane, causing the celluar contents of the neurons to spill out (essentially induces necrosis/inability for celluar metabolism to continue), hence the neurons are unable to function and as a result, brain cells (which are composed of mostly neurons) die off. The death of neurons produces the symptoms of "" disease"

Probs talk about how there are no action potentials generated or something like that.

[tashhhaaa]

do you mean the one where a mutation causes the chain to shorten? Yeah include met or whatever and i think it ended up being 7 amino acids long in the first part. cant remember exactly

Edit: yeah it couldve been 8, something along those lines

oh damn I wrote 6 for some reason

realising I did worse than I thought

[The Peasant]

Also- what did people write for the vaccine question? It was 4 marks...

[Gromekk]

something about it being attenuated, and causes the production of memory cells and antibodies, which grant the person long term immunity, then i wrote something about subsequent exposures

[Biology24123]

something about it being attenuated, and causes the production of memory cells and antibodies, which grant the person long term immunity, then i wrote something about subsequent exposures

Same