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November 26, 2020, 07:27:43 am

Author Topic: VCE Biology Question Thread  (Read 1900210 times)  Share 

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homeworkisapotato

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Re: VCE Biology Question Thread
« Reply #12990 on: September 23, 2020, 03:18:48 pm »
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Hey guys!
I was wondering for allopatric speciation would I still get a mark if I say 'the river separates two populations of blah blah with no gene flow between the population' instead of 'the river acts as a geographical barrier between the two populations'? Do I have to mention 'geographical barrier' to get a mark?
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darkz

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Re: VCE Biology Question Thread
« Reply #12991 on: September 23, 2020, 03:25:20 pm »
+6
Hey guys!
I was wondering for allopatric speciation would I still get a mark if I say 'the river separates two populations of blah blah with no gene flow between the population' instead of 'the river acts as a geographical barrier between the two populations'? Do I have to mention 'geographical barrier' to get a mark?

I'd lean towards yes, I'd give you the mark since you've identified the concepts behind what the question is asking i.e. you've essentially described what a geographical barrier is and its purpose. However, now that you know, next time try to include it in your answer so you don't risk losing the mark.
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homeworkisapotato

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Re: VCE Biology Question Thread
« Reply #12992 on: September 23, 2020, 03:27:40 pm »
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I'd lean towards yes, I'd give you the mark since you've identified the concepts behind what the question is asking i.e. you've essentially described what a geographical barrier is and its purpose. However, now that you know, next time try to include it in your answer so you don't risk losing the mark.
Thank you!! When I mention 'geographical barrier' do I have to talk about there being no gene flow?
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darkz

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Re: VCE Biology Question Thread
« Reply #12993 on: September 23, 2020, 03:29:26 pm »
+5
Thank you!! When I mention 'geographical barrier' do I have to talk about there being no gene flow?

Yes, I would still describe what it is/its purpose.
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Coolgalbornin03Lo

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Re: VCE Biology Question Thread
« Reply #12994 on: September 23, 2020, 05:36:34 pm »
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Is the oxygen produced in the light dependant reaction, the same oxygen which is the final receptor of H+ ions in the electron transport chain?

Also do we put oxygen as an input for ETC or not?

Also I was wondering how to develop an understand of bio which will lead to you to a high score? For unit 3 I feel like I understand it and how all the processes connect but for unit 4 I can answer the exams but it seems a bit shaky. Or should I just keep doing exams and go in depth on my “problem” areas?
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homeworkisapotato

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Re: VCE Biology Question Thread
« Reply #12995 on: September 23, 2020, 07:03:41 pm »
+1
Is the oxygen produced in the light dependant reaction, the same oxygen which is the final receptor of H+ ions in the electron transport chain?
I've been told that usually it diffuses out of the cell

Also do we put oxygen as an input for ETC or not?
Yes

Also I was wondering how to develop an understand of bio which will lead to you to a high score? For unit 3 I feel like I understand it and how all the processes connect but for unit 4 I can answer the exams but it seems a bit shaky. Or should I just keep doing exams and go in depth on my “problem” areas?
I'd say spend some time on your problem areas and then go back to practice exams
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Coolgalbornin03Lo

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Re: VCE Biology Question Thread
« Reply #12996 on: September 24, 2020, 10:40:07 am »
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Hi Guys!!!

In a ACED 2018 Exam in multiple choice it asks During translation:
and the answer is The ribosome reads mRNA 5’ to 3’. I didn’t pick this answer because although I know mRNA is 5‘ to 3’ I didn’t know ribosomes can read?

Also is simple diffusion slower than active transport? Thanks :)

EDIT: didn’t wanna double post, but in transcription is it necessary to say that “DNA molecule unwinds and is separated” and that “complementary RNA bases are added to a new molecule of mRNA”? I never say this in my answer but this company exam does......what’s vcaas accepted definition?

Is the repressor  protein in lac operon a transcriptional factor?
« Last Edit: September 24, 2020, 11:37:59 am by Coolgalbornin03Lo »
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homeworkisapotato

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Re: VCE Biology Question Thread
« Reply #12997 on: September 24, 2020, 11:26:05 am »
+2
Hi Guys!!!

In a ACED 2018 Exam in multiple choice it asks During translation:
and the answer is The ribosome reads mRNA 5’ to 3’. I didn’t pick this answer because although I know mRNA is 5‘ to 3’ I didn’t know ribosomes can read?
Yeah ribosomes read the strand from 5' to 3' in codons. So the ribosome reads codon by codon, and then a tRNA with a complementary anticodon come and bring a corresponding amino acid.

Also is simple diffusion slower than active transport? Thanks :)
I would think that it's faster as it doesn't require energy and it is a natural movement of a mass of molecules
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darkz

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Re: VCE Biology Question Thread
« Reply #12998 on: September 24, 2020, 11:50:19 am »
+5
Also is simple diffusion slower than active transport? Thanks :)

Yep, active transport would be faster than simple diffusion. If you think about it, active transport is forcing molecules into another compartment (e.g. you throwing a ball into another room) whereas simple diffusion is simply just flowing slowly into another compartment, also with bidirectional movement (e.g. a ball slowly rolling into another room).

Edit: well actually thinking about it, would depend on a variety of factors e.g. concentration of solute we're considering etc. e.g. at high concentrations simple diffusion might be faster since active transport would become saturated?

EDIT: didn’t wanna double post, but in transcription is it necessary to say that “DNA molecule unwinds and is separated” and that “complementary RNA bases are added to a new molecule of mRNA”? I never say this in my answer but this company exam does......what’s vcaas accepted definition?

Personally, I'd include it as at the end of the day, it's all about minimising risk.

Is the repressor  protein in lac operon a transcriptional factor?

Yes, any factor which modifies the rate or functioning of transcription would be termed a transriptional factor.
« Last Edit: September 24, 2020, 11:56:08 am by darkz »
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Coolgalbornin03Lo

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Re: VCE Biology Question Thread
« Reply #12999 on: September 24, 2020, 02:09:13 pm »
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Thanks darkz !!

With deviant cell behaviour and cancer- does the cell become immortal before accumulating mutations or does the cell accumulate mutations before becoming immortal?
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darkz

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Re: VCE Biology Question Thread
« Reply #13000 on: September 24, 2020, 02:20:43 pm »
+2
Thanks darkz !!

With deviant cell behaviour and cancer- does the cell become immortal before accumulating mutations or does the cell accumulate mutations before becoming immortal?

The cell would accumulate mutations before becoming immortal i.e. mutations in let's say, the gene controlling for the production of apoptosis initiating factors/receptors could lead to immortality.
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homeworkisapotato

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Re: VCE Biology Question Thread
« Reply #13001 on: September 24, 2020, 02:45:57 pm »
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Heyyy! Do we need to mention the direction in which RNA polymerase moves during transcription? Is it 3' to 5' or 5' to 3'? Different sources say different things!
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Re: VCE Biology Question Thread
« Reply #13002 on: September 24, 2020, 03:13:08 pm »
+1
Heyyy! Do we need to mention the direction in which RNA polymerase moves during transcription? Is it 3' to 5' or 5' to 3'? Different sources say different things!

RNA polymerase moves from the 3' end of the template towards the 5' end. I don't think you need to specify that exactly, but make sure to mention that the complementary strand is synthesized in the 5' --> 3' direction (which itself implies that RNA pol itself must be moving 3'-->5'). 
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homeworkisapotato

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Re: VCE Biology Question Thread
« Reply #13003 on: September 24, 2020, 03:21:32 pm »
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Thank you! Why do primers always bind to the 3' end?
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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13004 on: September 24, 2020, 03:37:15 pm »
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With hardy Weinberg how do you remember that p is dominant and q is recessive