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March 28, 2024, 08:23:11 pm

Author Topic: VCE Biology Question Thread  (Read 3570334 times)  Share 

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alchemy

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Re: VCE Biology Question Thread
« Reply #435 on: February 03, 2014, 09:32:11 pm »
+2
Still AOS1 :)
Same here :)
I don't see much point in tackling AOS2 right at this time. I'd rather just consolidate what I already know and probably teach myself how to explain stuff better lol

MM1

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Re: VCE Biology Question Thread
« Reply #436 on: February 03, 2014, 09:45:38 pm »
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Is the NEAP Biology Units 3&4 Questions Guide & Exam Guide worth it? I've heard it's erroneous in some areas?

Also, how are you guys collating your notes? Briefly or comprehensive?


Rishi97

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Re: VCE Biology Question Thread
« Reply #437 on: February 03, 2014, 09:53:20 pm »
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Well, my notes are often brief but informative. Pick out the main points (VCAA study guide should help) and revise it as much as you can till you get to the point where even one small word can trigger your memory.
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vox nihili

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Re: VCE Biology Question Thread
« Reply #438 on: February 03, 2014, 10:21:26 pm »
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I on the other hand did a shit tonne of notes and still do now. I know it's not an effective study technique, so if you can do something else, do it. For some reason, it's the only thing I can do consistently so if it works, it works. Importantly, you need to experiment with what you like and decide from there. No matter what suggestion you get, that'll never decide for you.
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popoy111

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Re: VCE Biology Question Thread
« Reply #439 on: February 03, 2014, 10:27:30 pm »
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Why do cells such as those on the surface of a root expend energy to take up some substances?

nerdmmb

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Re: VCE Biology Question Thread
« Reply #440 on: February 03, 2014, 10:33:39 pm »
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Why do cells such as those on the surface of a root expend energy to take up some substances?

I think you mean the protein receptors that are embedded in the cellular membranes.
They only expend energy when an ion needs to be taken against the concentration gradient.

grannysmith

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Re: VCE Biology Question Thread
« Reply #441 on: February 03, 2014, 10:37:38 pm »
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Why do cells such as those on the surface of a root expend energy to take up some substances?
Sometimes, a cell needs more of a substance than diffusion is capable of supplying. To overcome this, a cell may use active transport, which is against the concentration gradient and hence requires the input of energy.

vox nihili

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Re: VCE Biology Question Thread
« Reply #442 on: February 03, 2014, 11:06:56 pm »
+1
I think you mean the protein receptors that are embedded in the cellular membranes.
They only expend energy when an ion needs to be taken against the concentration gradient.

Not completely correct, but in the ball park.

The cellular environment is designed so that it can be different to the external environment. That's why the membrane is there; to create that difference. If diffusion alone set the cellular environment, it would be almost identical to its external environment and therefore having a cell would be redundant. Active transport is a way of setting up differences between the cell and external environment. This can be for a huge number of reasons, but normally it is used for what oddly suggested: because the cell needs extra stuff.
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TimewaveZero

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Re: VCE Biology Question Thread
« Reply #443 on: February 04, 2014, 08:33:32 pm »
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Just a question about cellular respiration...

During the Krebs Cycle, what acceptor molecules are produced?

I know FADH2 is produced, but I have two bio textbooks (Nature of Biology and Worlds within Worlds) the latter being from the 70's, but goes into a lot more detail than NoB. Now, Worlds within worlds suggests that 4 molecules of NADH2 is produced whereas nature of biology suggests 4 molecules of NADH is produced. What is correct?
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alondouek

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Re: VCE Biology Question Thread
« Reply #444 on: February 04, 2014, 08:39:55 pm »
+1
I would advise that you don't use any science textbook from the 70s; we've come a long way since then :P

The Kreb's Cycle outputs include:
- 3x NADH/H+
- 1x FADH2
- either 1x ATP or 1x GTP (depending on cell type)

I think you (or the authors) may have gotten confused between FADH2 (which is correct) and NADH2, which is a less common name for the output NADH/H+. We tend not to group the NADH and H+ together by calling them NADH2 because that would imply that the output is an NADH2 molecule, which isn't the case.
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TimewaveZero

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Re: VCE Biology Question Thread
« Reply #445 on: February 04, 2014, 08:44:24 pm »
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I would advise that you don't use any science textbook from the 70s; we've come a long way since then :P

The Kreb's Cycle outputs include:
- 3x NADH/H+
- 1x FADH2
- either 1x ATP or 1x GTP (depending on cell type)

I think you (or the authors) may have gotten confused between FADH2 (which is correct) and NADH2, which is a less common name for the output NADH/H+. We tend not to group the NADH and H+ together by calling them NADH2 because that would imply that the output is an NADH2 molecule, which isn't the case.

Ah I see, thankyou.

And yes, I am definitely not relying on my 70's textbook, I only use it to read over what I've read from my textbook, as it goes into more detail.
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MM1

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Re: VCE Biology Question Thread
« Reply #446 on: February 04, 2014, 09:01:00 pm »
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Why aren't interleukins hormones?

vox nihili

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Re: VCE Biology Question Thread
« Reply #447 on: February 04, 2014, 09:10:47 pm »
+1
Why aren't interleukins hormones?

Hormones are long distance, interleukins aren't.
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Re: VCE Biology Question Thread
« Reply #448 on: February 04, 2014, 09:12:58 pm »
+1
Why aren't interleukins hormones?

Interleukins are a type of cytokine. Cytokines differ from hormones in that cytokines are secreted by a wide range of cellular origins, while true hormones are only secreted from specific glands. Truth be told though, the distinction is often tough to make as there is a strong overlap between the definitions of hormones and cytokines in relation to immune function.
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vox nihili

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Re: VCE Biology Question Thread
« Reply #449 on: February 04, 2014, 09:32:05 pm »
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Interleukins are a type of cytokine. Cytokines differ from hormones in that cytokines are secreted by a wide range of cellular origins, while true hormones are only secreted from specific glands. Truth be told though, the distinction is often tough to make as there is a strong overlap between the definitions of hormones and cytokines in relation to immune function.

Biology is full of rubbish like that, hey? Because it's such an old science and has generated so much interest, so many of the different names for things overlap. Biologists spend half of their time arguing about what's what to be honest... hahah
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