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June 02, 2020, 01:57:26 am

Author Topic: VCE Biology Question Thread  (Read 1670648 times)  Share 

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Re: VCE Biology Question Thread
« Reply #10365 on: May 28, 2018, 08:31:01 pm »
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If you already have notes then I would start with mindmaps and then do summaries for the areas you don't understand as well.
Thanks :)
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PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #10366 on: May 28, 2018, 08:51:16 pm »
+1
How do I go about setting out a mind map? I've never particularly used any with my days at school thus far. Thanks
The way I did it was just pick a topic and write down what you know about it. For example, for immunity I might write down physical & chemical barriers (and examples), then innate internal defences (like inflammation and complement) then types of adaptive immunity. Or I might just do adaptive immunity and draw how humoral and cell-mediated immunity are connected (through T helper cells) and how that links into innate immunity (through antigen presenting cells).

Basically just pick a topic and try to connect it to other topics that you've learnt about.
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011116

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Re: VCE Biology Question Thread
« Reply #10367 on: May 28, 2018, 09:12:47 pm »
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Aim: to investigate the effect of basil leaves on the amount of Pseudomonas Aeruginosa produced
what would a research question be for this specific aim?


vox nihili

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Re: VCE Biology Question Thread
« Reply #10368 on: May 28, 2018, 09:24:22 pm »
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Aim: to investigate the effect of basil leaves on the amount of Pseudomonas Aeruginosa produced
what would a research question be for this specific aim?



What do you think?
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011116

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Re: VCE Biology Question Thread
« Reply #10369 on: May 28, 2018, 09:29:01 pm »
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What do you think?
will basil leaves effect the amount of pseudomonas aeruginosa produced?

vox nihili

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Re: VCE Biology Question Thread
« Reply #10370 on: May 28, 2018, 09:44:54 pm »
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will basil leaves effect the amount of pseudomonas aeruginosa produced?

To be honest, off the top of my head I don't really know, but there are some ideasóthe fact that it's been suggested as a topic would suggest that it probably does. WHy do you think basil leaves might kill/stop replicating P.aeurginosa?
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FabAsianZung

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Re: VCE Biology Question Thread
« Reply #10371 on: May 28, 2018, 11:10:04 pm »
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I know NK cells(immune) and Cytotoxic T Cell(adaptive) perform the same role. But what's the difference? Does Cytotoxic T Cell targets specific antigen, since it belongs in the adaptive(specific) immunity?

Thanks beforehand!
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PopcornTime

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Re: VCE Biology Question Thread
« Reply #10372 on: May 28, 2018, 11:21:07 pm »
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Why is it that high auxin and low cytokinin promotes root growth, whereas high cytokinin and low auxin promotes shoot growth in a callus?
- would it have something to do with the actual callus or more so the ratio between the 2 hormones

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Re: VCE Biology Question Thread
« Reply #10373 on: May 28, 2018, 11:26:36 pm »
+1
I know NK cells(immune) and Cytotoxic T Cell(adaptive) perform the same role. But what's the difference? Does Cytotoxic T Cell targets specific antigen, since it belongs in the adaptive(specific) immunity?

Thanks beforehand!
As far as Iím aware (and all you need to know for VCE) the main difference is that NK cells are innate which means that they do not recognise a specific antigen whereas Tc cells are adaptive so they recognise their specific complementary antigen. They both release perforin which kills the infected cell.



The parts I've bolded happen usually in lymph nodes - the APC (usually a dendritic cell) will migrate from the site of infection to a lymph node and present peptide therein. B cell activation happens in the lymph node too.
Thanks! ;D Iím fairly sure Vox has told me this before, I still mess it up haha
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darkz

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Re: VCE Biology Question Thread
« Reply #10374 on: May 29, 2018, 09:59:45 am »
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I know NK cells(immune) and Cytotoxic T Cell(adaptive) perform the same role. But what's the difference? Does Cytotoxic T Cell targets specific antigen, since it belongs in the adaptive(specific) immunity?

Thanks beforehand!

This is outside of the scope of the VCE course, but its some extra interesting info about it and you can find it in the Nature of Biology textbook if you use it. So basically, Natural Killer cells have two receptors, a killer activation receptor (KAR) and killer inhibitory receptor (KIR). KAR binds with surface proteins released by virally infected cells or cancerous cells in distress, while KIR binds to MHC Class I markers on the cell. If the KIR binds with a sufficient number of MHC Class I markers, then the order to kill is overridden. (We can get a lack of MHC Class I markers when viruses or cancer cells inhibit or destroy MHC Class I markers on the cell surface). Therefore, if the cell is lacking of MHC Class I markers, then the signal to kill won't be overridden and then the NK cell will secrete perforin damaging the plasma membrane leading to lysis. If the cell has sufficient MHC Class I markers, then I'm pretty sure that those cells are left for cytotoxic T cells.
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at918

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Re: VCE Biology Question Thread
« Reply #10375 on: May 29, 2018, 08:21:21 pm »
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Hi could someone help me with this question?

'Were controls included in your experiment? If so, describe them. If not, explain the negative and positive control that could/ should be included'.

 It is an experimental question from a prac we did in class where we were required to 'Identify a treatment for people infected with a food borne pathogen (GTAC)'. (we tested the effects of different antibiotics against E.coli)

Thanks in advance.

darkz

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Re: VCE Biology Question Thread
« Reply #10376 on: May 29, 2018, 08:25:43 pm »
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Hi could someone help me with this question?

'Were controls included in your experiment? If so, describe them. If not, explain the negative and positive control that could/ should be included'.

 It is an experimental question from a prac we did in class where we were required to 'Identify a treatment for people infected with a food borne pathogen (GTAC)'. (we tested the effects of different antibiotics against E.coli)

Thanks in advance.

Well a positive control is where you know the response of the experiment to compare within unknowns, in this case it would be a plate treated with a known antibiotic against E. coli (So obviously there would be clear space around the antibiotic disc as we know it works)

A negative control is where no response is expected, so in this case it would probably just be a plate treated with a known antibiotic that does not work against E. coli (So obviously, there would be no clear space around the antibiotic disc as we know it does not work)
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PopcornTime

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Re: VCE Biology Question Thread
« Reply #10377 on: May 29, 2018, 08:56:38 pm »
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Why is it that active immunity is long-lived whereas passive immunity is short-lived?
- due to presence of memory cells in the body which are able to produce antibodies





darkz

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Re: VCE Biology Question Thread
« Reply #10378 on: May 29, 2018, 09:01:33 pm »
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Why is it that active immunity is long-lived whereas passive immunity is short-lived?
- due to presence of memory cells in the body which are able to produce antibodies

Yeh, that seems right - the memory cells allow the long lived nature of active immunity
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FabAsianZung

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Re: VCE Biology Question Thread
« Reply #10379 on: May 29, 2018, 10:41:26 pm »
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"Design process in experiments"

What is this? And what do you need to know according to the study design? How is this gonna be applied to experimental SACs?

Thanks beforehand!
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