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March 29, 2024, 06:35:22 am

Author Topic: VCE Biology Question Thread  (Read 3570876 times)  Share 

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PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #11025 on: October 28, 2018, 08:54:48 am »
+1
1) What is the 'functional importance' of the four levels of protein structure aside from tertiary and quartenary proteins actually doing things?
2) What's the difference between RNA processing and transcription? Would I just refer to the post-transcriptional modifications as RNA processing?
3) How does temperature affect the rate of photosynthesis? I've heard mixed things about this.
4) Where do pheromones originate from usually (i.e what glands)?
1. It's basically just that. The protein structure gives it a specific 3D shape that allows it to function.
2. RNA processing occurs after transcription, it's just another name for post transcriptional modifications.
3. You'll have heard different things because VCE oversimplifies it. For VCE, lower temperature result in slower rates of photosynthesis, higher temperatures result in faster rate up to a point, and then the rate drops to 0 as temperatures increase because the proteins are denatured.
4. They're released from exocrine glands, but you can't really be any more specific than that because there's heaps of different types produced in lots of different spots, for example in humans they're produced in testes and ovaries, adrenal, and apocrine glands.
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EllingtonFeint

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Re: VCE Biology Question Thread
« Reply #11026 on: October 28, 2018, 09:04:39 am »
0
Why are there two exams for some past years?
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PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #11027 on: October 28, 2018, 09:06:42 am »
+1
Why are there two exams for some past years?
There used to be 2 exams during the year. The U3 exam was in June and the U4 in November. It changed a few years ago to have one exam for both U3 and U4 at the end of the year.
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EllingtonFeint

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Re: VCE Biology Question Thread
« Reply #11028 on: October 28, 2018, 09:07:53 am »
0
Q1 what is molecule A? Is it a carbohydrate?? (1st image)

Why is d correct? Is it because 1 fatty acid produces 8 Acetyl CoA? If so, what would be the ATP ratio produced (like fatty acid vs glucose - possibly how many Acetyl CoA would one glucose molecule produce?))
2nd image for the carbohydrate question. Oops... :o

There used to be 2 exams during the year. The U3 exam was in June and the U4 in November. It changed a few years ago to have one exam for both U3 and U4 at the end of the year.

So definitely do both?

Mod edit (PF): Merged posts. You can edit your posts by using the 'modify' button at the top right :)
« Last Edit: October 28, 2018, 09:23:47 am by PhoenixxFire »
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Azim.m

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VCE Biology Question Thread
« Reply #11029 on: October 28, 2018, 09:18:06 am »
+3
2nd image for the carbohydrate question. Oops... :o

Yep. Second image is cellulose which is a polymer of glucose, hence answer would be C

PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #11030 on: October 28, 2018, 09:30:52 am »
+3
Why is d correct? Is it because 1 fatty acid produces 8 Acetyl CoA? If so, what would be the ATP ratio produced (like fatty acid vs glucose - possibly how many Acetyl CoA would one glucose molecule produce?))

So definitely do both?
Don't worry about that question, it's not relevant. On that study design you had to know more details about the krebs cycle, which must have included knowing how many acetyl-coA are produced (presumably less than 8), that's the only way I can think of that you'd be able to answer that, so just skip it.

Yep do both. Or if you're doing significantly worse in either U3 or U4 then just focus on that unit. Doing both of them is equivalent to doing one end of year exam.
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EllingtonFeint

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Re: VCE Biology Question Thread
« Reply #11031 on: October 28, 2018, 09:42:40 am »
0
So, insulin is a hormone
But it’s a peptide hormone and peptide hormones are made up of amino acids...so it’s also a protein, yes?
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PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #11032 on: October 28, 2018, 09:47:48 am »
0
So, insulin is a hormone
But it’s a peptide hormone and peptide hormones are made up of amino acids...so it’s also a protein, yes?
Yeah basically, like how enzymes are also proteins. Call it a hormone on the exam though, not a protein because hormone is more specific, but yeah that's how it's made.
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EllingtonFeint

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Re: VCE Biology Question Thread
« Reply #11033 on: October 28, 2018, 09:49:40 am »
0
Yeah basically, like how enzymes are also proteins. Call it a hormone on the exam though, not a protein because hormone is more specific, but yeah that's how it's made.

Sorry for the constant questions... I don’t wanna keep starting new replies :-[

If there was no lactase in a cell, would lactose still be broken down but really slowly?
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PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #11034 on: October 28, 2018, 09:56:22 am »
0
Sorry for the constant questions... I don’t wanna keep starting new replies :-[

If there was no lactase in a cell, would lactose still be broken down but really slowly?
No worries, that’s what this thread is here for :)

For the sake of VCE, assume it doesn’t break down at all.
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EllingtonFeint

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Re: VCE Biology Question Thread
« Reply #11035 on: October 28, 2018, 10:01:16 am »
0
No worries, that’s what this thread is here for :)

For the sake of VCE, assume it doesn’t break down at all.

This was in the NEAP paper, and I think I read somewhere that NEAP was kinda a dodgy paper... so just disregard it completely?
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PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #11036 on: October 28, 2018, 10:04:58 am »
+1
This was in the NEAP paper, and I think I read somewhere that NEAP was kinda a dodgy paper... so just disregard it completely?
Yeah NEAP tends to include things outside of the study design. Theoretically it would still break down very slowly (enzymes just lower the energy required for a reaction to occur, they don’t cause a reaction) but VCAA won’t ask you to explain that
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vox nihili

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Re: VCE Biology Question Thread
« Reply #11037 on: October 28, 2018, 10:07:26 am »
+3
This was in the NEAP paper, and I think I read somewhere that NEAP was kinda a dodgy paper... so just disregard it completely?
Yeah NEAP tends to include things outside of the study design. Theoretically it would still break down very slowly (enzymes just lower the energy required for a reaction to occur, they don’t cause a reaction) but VCAA won’t ask you to explain that

If any chemistry students are reading this exchange, of course you would know that the reaction proceeds slowly in the absence of lactase; however, for the purposes of Biology I'm with PF—totally irrelevant in VCE.
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EllingtonFeint

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Re: VCE Biology Question Thread
« Reply #11038 on: October 28, 2018, 10:12:37 am »
0
Is it okay to say that TAQ polymerase enzyme uses the primers as an anchor to replicate each strand?
What would be better wording??
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PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #11039 on: October 28, 2018, 10:14:16 am »
+2
Is it okay to say that TAQ polymerase enzyme uses the primers as an anchor to replicate each strand?
What would be better wording??
I would say that it uses them as a starting point to build a complementary strand.

Edit: complementary to the strand the primer is attached to, not complementary to the primer. Be careful how you word that.
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