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March 28, 2024, 09:38:44 pm

Author Topic: VCE Biology Question Thread  (Read 3570407 times)  Share 

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ValiantIntellectual

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Re: VCE Biology Question Thread
« Reply #4545 on: January 15, 2015, 02:34:48 pm »
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Evening everyone, I see I am late to the party!
Anyway, what foundation of chemistry is needed for this subject? I dropped chem after a few lessons of it during orientation so what do I need to know?

grannysmith

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Re: VCE Biology Question Thread
« Reply #4546 on: January 15, 2015, 02:46:29 pm »
+1
Evening everyone, I see I am late to the party!
Anyway, what foundation of chemistry is needed for this subject? I dropped chem after a few lessons of it during orientation so what do I need to know?
Nothing much. Just know, for example, the properties of water, the elements found in each biomacromolecule, chemical structure of amino acids etc. You don't actually need a chemistry background; you'll be taught everything you need to know (in terms of chemistry) and I don't think there is any prerequisite knowledge required.

doher109

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Re: VCE Biology Question Thread
« Reply #4547 on: January 15, 2015, 03:32:05 pm »
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Evening everyone, I see I am late to the party!
Anyway, what foundation of chemistry is needed for this subject? I dropped chem after a few lessons of it during orientation so what do I need to know?

Valiant, I personally did 3/4 Chemistry along with Biology. I found whilst it provided advantageous to a degree for Unit 3 AoS 1, it was also a bad thing at times.

I regularly went into too much detail with answers, and touched on topics not taught in Biology. Put simply, knowledge of Chemistry can make things easier to follow but can potentially make your answers too complex.
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winchesteraddict

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Re: VCE Biology Question Thread
« Reply #4548 on: January 15, 2015, 11:28:42 pm »
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HEY! :)
Just a question 8|
Do we need to know about the membranes of the brains (ie, Dura matter, Arachnoid and Pia matter), because NoB mentions cerebrospinal fluid (that IS produced in the sub arachnoid space)?
Am I going in too deep?

Scooby

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Re: VCE Biology Question Thread
« Reply #4549 on: January 15, 2015, 11:29:18 pm »
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HEY! :)
Just a question 8|
Do we need to know about the membranes of the brains (ie, Dura matter, Arachnoid and Pia matter), because NoB mentions cerebrospinal fluid (that IS produced in the sub arachnoid space)?
Am I going in too deep?

Absolutely not :P
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nerdmmb

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Re: VCE Biology Question Thread
« Reply #4550 on: January 15, 2015, 11:31:55 pm »
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Incase I haven't mentioned it before, I would highly recommend listening to Douchy's Biology Podcasts and watching KhanAcademy videos. It overs almost the entire course :)

grannysmith

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Re: VCE Biology Question Thread
« Reply #4551 on: January 16, 2015, 12:15:49 pm »
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HEY! :)
Just a question 8|
Do we need to know about the membranes of the brains (ie, Dura matter, Arachnoid and Pia matter), because NoB mentions cerebrospinal fluid (that IS produced in the sub arachnoid space)?
Am I going in too deep?
The study design will guide you on what you need to know, as well as the VCAA Biology FAQs.

doher109

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Re: VCE Biology Question Thread
« Reply #4552 on: January 17, 2015, 11:45:13 am »
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The study design will guide you on what you need to know, as well as the VCAA Biology FAQs.

Also take note the membranes of the brain are not required in Y12 Biology  :P
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grannysmith

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Re: VCE Biology Question Thread
« Reply #4553 on: January 17, 2015, 11:48:05 am »
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Also take note the membranes of the brain are not required in Y12 Biology  :P
Haha, that's what I was trying to imply :p

paper-back

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Re: VCE Biology Question Thread
« Reply #4554 on: January 18, 2015, 01:46:57 pm »
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Beware, silly question:
How does anything just diffuse through the cell membrane, do substances just go though gaps in the cell membrane?
Even then wouldn't it face forces of attraction from the hydrophobic tails? E.g. in the case of lipid movement through the cell membrane. Wouldn't dispersion forces act between the lipid and hydrophobic tails therefore causing it to 'get stuck'  for some periods of time

grannysmith

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Re: VCE Biology Question Thread
« Reply #4555 on: January 18, 2015, 02:03:14 pm »
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Beware, silly question:
How does anything just diffuse through the cell membrane, do substances just go though gaps in the cell membrane?
Even then wouldn't it face forces of attraction from the hydrophobic tails? E.g. in the case of lipid movement through the cell membrane. Wouldn't dispersion forces act between the lipid and hydrophobic tails therefore causing it to 'get stuck'  for some periods of time
Pretty much. As the plasma membrane is fluid-like, pores appear between the phospholipids and hence certain molecules are able to diffuse across. Remember that dispersion forces are often disregarded due to their relative weakness, and as such, do not really inhibit the diffusion of substances (I think, at least for VCE Bio :p).

EspoirTron

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Re: VCE Biology Question Thread
« Reply #4556 on: January 18, 2015, 02:32:22 pm »
+1
Beware, silly question:
How does anything just diffuse through the cell membrane, do substances just go though gaps in the cell membrane?
Even then wouldn't it face forces of attraction from the hydrophobic tails? E.g. in the case of lipid movement through the cell membrane. Wouldn't dispersion forces act between the lipid and hydrophobic tails therefore causing it to 'get stuck'  for some periods of time

Not a silly question at all :)
So a lot of molecules like oxygen and water will freely diffuse across the plasma membrane, since they're relatively small.
For larger molecules like sugars and amino acids they diffuse via a process of facilitated diffusion, where they bind to membrane-spanning transport proteins and diffuse across through protein conformational changes; this doesn't require energy.
For ions moved against their concentration gradient, active transport is used - i.e. energy demanding. A classic example is of course the K+/Na+ ATPase pump.

I am not 100% here, but I don't know if lipid diffusion is in Biology 3/4; lipid diffusion is a bit more complex than the former.
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cosine

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Re: VCE Biology Question Thread
« Reply #4557 on: January 18, 2015, 07:42:08 pm »
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I needed to comment here so i can see future posts/questions.

But I wont be boring and ill ask a question:

On a DNA strand, I know it's double stranded, but what do the 5' and 3' at each end actually mean? Thanks
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alondouek

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Re: VCE Biology Question Thread
« Reply #4558 on: January 18, 2015, 07:57:10 pm »
+1
I needed to comment here so i can see future posts/questions.

But I wont be boring and ill ask a question:

On a DNA strand, I know it's double stranded, but what do the 5' and 3' at each end actually mean? Thanks

I made mention of this in a post I made quite a while ago (ctrl + F and search "tiny side note"): A Guide to Success in VCE Biology

The principle is called Directionality. Basically, the 5' end of the DNA strand is designated as such because that end of the strand has at its terminus the 5th carbon in the deoxyribose ring (or ribose ring if the strand is RNA).

5' and 3' are just aspects of a carbon-numbering convention, as with this furanose molecule:
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Reus

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Re: VCE Biology Question Thread
« Reply #4559 on: January 18, 2015, 08:01:02 pm »
+1
I needed to comment here so i can see future posts/questions.

But I wont be boring and ill ask a question:

On a DNA strand, I know it's double stranded, but what do the 5' and 3' at each end actually mean? Thanks
They're the carbon molecules which are designated with numbers in order to identify the direction in which they bind, elongate etc... (There are 5 carbons in a deoxyribose ring).
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