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March 29, 2024, 01:34:03 am

Author Topic: VCE Biology Question Thread  (Read 3570608 times)  Share 

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millie96

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Re: VCE Biology Question Thread
« Reply #870 on: February 24, 2014, 07:53:58 pm »
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What travels through carrier proteins and what type of transport is it?

alchemy

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Re: VCE Biology Question Thread
« Reply #871 on: February 24, 2014, 07:56:57 pm »
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What travels through carrier proteins and what type of transport is it?

Generally, large, charged, lipid insoluble substances must travel through carrier proteins in a process called 'Facilitated Diffusion'.

alchemy

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Re: VCE Biology Question Thread
« Reply #872 on: February 24, 2014, 07:58:39 pm »
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Thanks! Btw did you mean turgor pressure?

Yes, I did. Sorry for the spelling error!

Rishi97

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Re: VCE Biology Question Thread
« Reply #873 on: February 24, 2014, 07:59:12 pm »
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So you can graph it and refer to it when explaining your results.

But u can also graph the actual weight so why percent change in mass?
2014: VCE completed
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nerdmmb

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Re: VCE Biology Question Thread
« Reply #874 on: February 24, 2014, 08:03:52 pm »
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But u can also graph the actual weight so why percent change in mass?

Because some of the potatoes may have decreased in mass so by graphing the percentage, it makes it much more easier to understand.

alchemy

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Re: VCE Biology Question Thread
« Reply #875 on: February 24, 2014, 08:05:15 pm »
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But u can also graph the actual weight so why percent change in mass?

You can, if you want, and if your teacher allows it. However, you will find that it's slightly more readable to sketch the graph against percent change in mass. Explaining, your results using percentage change in mass probably sounds better? Idk, there's not all that much of a big difference really.

RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #876 on: February 24, 2014, 08:07:47 pm »
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When you are defining terms such as 'active transport' or 'carrier proteins' and you talk about the movement of substances across membranes, would it be correct to say 'plasma membrane' or 'membrane' in general?

eg. - Active transport is the movement of dissolved substances across the plasma membrane, which requires energy in order to move against a concentration gradient (from a region of relatively low solute concentration to a region of relatively high solute concentration) or:

Active transport is the movement of dissolved substances across a membrane, which requires energy in order to move against a concentration gradient (from a region of relatively low solute concentration to a region of relatively high solute concentration)?

Thanks! :)

Rishi97

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Re: VCE Biology Question Thread
« Reply #877 on: February 24, 2014, 08:08:40 pm »
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You can, if you want, and if your teacher allows it. However, you will find that it's slightly more readable to sketch the graph against percent change in mass. Explaining, your results using percentage change in mass probably sounds better? Idk, there's not all that much of a big difference really.

Thanks. Our teacher said that % change in mass will remove any errors in weighing the potato. Removes variation in initial mass. But that doesn't make sense to me. Ah well, I'll just memorise it
« Last Edit: February 24, 2014, 08:16:17 pm by Rishi97 »
2014: VCE completed
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RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #878 on: February 24, 2014, 08:10:06 pm »
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Does anyone have any good sample questions, involving the movement of substances across membranes, in preparation for the upcoming SAC? :)


rhinwarr

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Re: VCE Biology Question Thread
« Reply #879 on: February 24, 2014, 08:11:35 pm »
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What are the functional roles of alpha helices and beta sheets in proteins?

Rishi97

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Re: VCE Biology Question Thread
« Reply #880 on: February 24, 2014, 08:17:08 pm »
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Does anyone have any good sample questions, involving the movement of substances across membranes, in preparation for the upcoming SAC? :)

Check out pg 48 :P
2014: VCE completed
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alchemy

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Re: VCE Biology Question Thread
« Reply #881 on: February 24, 2014, 08:20:41 pm »
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What are the functional roles of alpha helices and beta sheets in proteins?

They give a protein it's physical characteristics. For example, silk is composed mostly of beta pleated sheets, and as a result is not very stretchy. However, most proteins have actually a combination of both alpha Helices and beta pleated sheets. Some have separate versions of both secondary structures, such as alpha keratin and beta keratin.

It's more of its tertiary or quaternary structure that gives it a 'functional role' as in the case of enzymes.

RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #882 on: February 24, 2014, 08:35:16 pm »
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RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #883 on: February 24, 2014, 08:36:32 pm »
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Does anyone have any good analogies they use when remembering things for biology?

I remember that "All good things are pure"
So, Adenine and Guanine are purines :)

- I read it off some website!

katiesaliba

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Re: VCE Biology Question Thread
« Reply #884 on: February 25, 2014, 12:09:26 am »
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Care to share some thoughts or attempt these first :) ?

1)Which cell organelles are the heaviest and which are the lightest? Could someone please make a list for me!
I know that the nucleus is the heaviest, but I'm not entirely sure what order the other organelles follow.
2)How do you determine the size (in micrometers) of cells when given the magnification?
No idea.  :-[
3)What's the average size of prokaryotic and eukaryotic cells (in micrometers)?
Once again, I have no idea. I only know that prokaryotic cells are generally smaller than eukaryotic cells.
4)Why is protein and RNA more prevalent than DNA, lipids, and glycogen in prokaryotic cells?
Prokaryotic cells are simpler, therefore their structures mainly consist of proteins........not too sure about the rest!
5)Are the sequence of bases which code for amino acids universal over all organisms?
I have a feeling that they are because, after all, all DNA and RNA are made up from the same basic nucleotide structures. The question from the practice exam that I was doing specifically referred to TAG which I know is stop codon. It asked if it was present in cat's as a stop codon too.
Bachelor of Science (Immunology major) - The University of Melbourne