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March 29, 2024, 07:42:40 am

Author Topic: VCE Biology Question Thread  (Read 3570941 times)  Share 

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Acegtr

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Re: VCE Biology Question Thread
« Reply #13410 on: April 16, 2021, 05:18:37 pm »
0
Hi, I've got a question regarding the equation for photosynthesis. I've seen some written as
6CO2 + 6H2O ------> C6H12O6 + 6O2
whilst others wrote
6CO2 + 12H2O-----> C6H12O6 + 6O2 + 6H2O

which one is correct? Or are both of them correct and I'm missing something?

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13411 on: April 16, 2021, 05:47:41 pm »
+6
Both are correct the first one is just the simplified one

PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #13412 on: April 16, 2021, 09:22:58 pm »
+5
^They're both correct. It's because that equation is the overall equation for photosynthesis - it's multiple processes so in one it uses up all the water but then later it makes some water.
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Harrycc3000

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Re: VCE Biology Question Thread
« Reply #13413 on: April 16, 2021, 11:39:26 pm »
+5
Hi, I've got a question regarding the equation for photosynthesis. I've seen some written as
6CO2 + 6H2O ------> C6H12O6 + 6O2
whilst others wrote
6CO2 + 12H2O-----> C6H12O6 + 6O2 + 6H2O

which one is correct? Or are both of them correct and I'm missing something?
lookout for which type of equation they want on the question. On a sac last year they asked write the equation of photosynthesis where water is both a product and a reactant if you don’t read a photosynthesis question like that properly that could trip you up but if they dont specify any equation is fine.
VCE 2020: Biology [50]
VCE 2021: Mathematical Methods [44], Specialist Mathematics [43], Psychology [45], Chemistry [45], English Language [49]
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Acegtr

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Re: VCE Biology Question Thread
« Reply #13414 on: April 17, 2021, 03:09:51 pm »
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Oh ok, thanks for the help!!

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13415 on: April 19, 2021, 02:15:43 pm »
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If someone could help with this question

RG08

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Re: VCE Biology Question Thread
« Reply #13416 on: April 20, 2021, 12:08:57 pm »
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Hi,
Is there anyway we can buy/ source Insight, Aced and other private company past papers who only sell it to the schools? What is the school is not willing to buy them?

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13417 on: April 22, 2021, 10:44:23 pm »
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if someone could help with this would it be c

Owlbird83

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Re: VCE Biology Question Thread
« Reply #13418 on: April 23, 2021, 07:09:11 am »
+5
if someone could help with this would it be c
Yeah, that's correct!

a is wrong because it says atropine and acetylcholine are similar shaped (not complementary), so they wouldn't bind together.
b would be wrong because it couldn't hyperpolarise the cell by binding to the receptor on channels, something binding would either do nothing (channels remain closed) or cause the channel to open and let in positive ions to depolarise the neuron and bring about an AP. pls correct me if i've explained this wrong
c yeah they are similar shaped so would be competing for the binding spot as they can both fit
d atropine would be an antagonist (not agonist) as it wouldn't produce APs as it says in the stem.
« Last Edit: April 23, 2021, 07:26:05 am by Owlbird83 »
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specimen

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Re: VCE Biology Question Thread
« Reply #13419 on: April 23, 2021, 06:32:51 pm »
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Hello atarnotes, I recently received my SAC mark for my first SAC and it ended up just above 50 percent. I am still very disappointed with this but I guess I did relatively well because the average was around 38 percent (the SAC was incredibly hard to score well). I dont really understand how the SACs are scaled and stuff but if I was to end up rank 1 would this mean that I get scaled to 100 or the best exam score or something even though I got a garbage score on my SAC? Is it possible to get a bad SAC mark that gives you a high ranking (in comparison to everyone else) and then that equates to something 90+ for your scaled score at the end of the year? my mark is still really disappointing considering the effort i put in and i feel like my study score is going to be screwed bc of this mark and impossible to get above 45.

Sine

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Re: VCE Biology Question Thread
« Reply #13420 on: April 23, 2021, 06:48:30 pm »
+8
Hello atarnotes, I recently received my SAC mark for my first SAC and it ended up just above 50 percent. I am still very disappointed with this but I guess I did relatively well because the average was around 38 percent (the SAC was incredibly hard to score well). I dont really understand how the SACs are scaled and stuff but if I was to end up rank 1 would this mean that I get scaled to 100 or the best exam score or something even though I got a garbage score on my SAC? Is it possible to get a bad SAC mark that gives you a high ranking (in comparison to everyone else) and then that equates to something 90+ for your scaled score at the end of the year? my mark is still really disappointing considering the effort i put in and i feel like my study score is going to be screwed bc of this mark and impossible to get above 45.
Hi, specimen! Welcome to ATAR Notes

Ultimately, your sac rank is what is actually important not what percentage you score. So your 50% may be quite good if the cohort average was only 38%.

Yes, if you are rank 1 that means that your sac scores will be scaled to the standerdised equivalent of the highest exam score that is scored by your cohort. Also yes if your rank is high but your actual score is low it is still possible for your sacs to scale to a 90+ score at the end of the year.

Hope this helps :)


Oynx

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Re: VCE Biology Question Thread
« Reply #13421 on: April 25, 2021, 11:23:20 pm »
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Till what point does a B cell stay naive? and when does it mature?

Thanks
2021 - Biology | Further mathematics

Owlbird83

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Re: VCE Biology Question Thread
« Reply #13422 on: April 26, 2021, 09:46:20 am »
+11
Till what point does a B cell stay naive? and when does it mature?

Thanks
B cells are naive until they encounter an antigen that is complementary to their B cell receptor. The B cell activation occurs when this antigen binds to the naive B cell's receptor and they are stimulated to proliferate and differentiate into B plasma cells and memory B cells.

Naive B cells are considered 'mature' —  B cells mature in the bone marrow by going through tests to make sure their receptors are functional (make sure they react to pathogens not self cells).
(Activation is the term used to describe when the naive B cells are exposed to the antigen and proliferate & differentiate.)
« Last Edit: April 26, 2021, 09:51:10 am by Owlbird83 »
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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13423 on: April 27, 2021, 03:20:29 pm »
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Based only on an amino acid sequence how would you recognise an integral membrane protein

PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #13424 on: April 27, 2021, 03:39:54 pm »
+2
Based only on an amino acid sequence how would you recognise an integral membrane protein
You wouldn't. There are some clues (mostly based on whether they're hydrophillic/phobic and how they're folded) but not 100% accuracy and way beyond vce.
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