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March 29, 2024, 12:41:41 pm

Author Topic: VCE Biology Question Thread  (Read 3571169 times)  Share 

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PopcornTime

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Re: VCE Biology Question Thread
« Reply #10515 on: June 26, 2018, 05:50:55 pm »
+2
I found that on my mid year exam some questions related to experimental design, which is something that I hadn't revised or payed much attention to. Does anyone know how big of a part this is in the study design? Also are there any resources that can help with those questions?
Thanks :)

Definitely a big part of the study design! Majority of last year's exam related to experimental design and there was even a 14 mark question (with sub questions) relating to a whole experiment on cell respiration. I suggest reviewing through the general structure of prac reports: aim, hypo, variables, materials, method, results, discussion and conclusion.

Owlbird83

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Re: VCE Biology Question Thread
« Reply #10516 on: June 26, 2018, 07:05:03 pm »
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Definitely a big part of the study design! Majority of last year's exam related to experimental design and there was even a 14 mark question (with sub questions) relating to a whole experiment on cell respiration. I suggest reviewing through the general structure of prac reports: aim, hypo, variables, materials, method, results, discussion and conclusion.
Thank you!
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PopcornTime

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Re: VCE Biology Question Thread
« Reply #10517 on: June 27, 2018, 01:20:21 pm »
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In what situation would T helper cells activate NK cells instead of cytotoxic T cells?

Also for 2008 Bio exam question 5 b), why can't you talk about the humoral response?

darkz

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Re: VCE Biology Question Thread
« Reply #10518 on: June 27, 2018, 01:26:38 pm »
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In what situation would T helper cells activate NK cells instead of cytotoxic T cells?

Also for 2008 Bio exam question 5 b), why can't you talk about the humoral response?

I don't believe that T helper cells really interact with NK cells, as NK cells are apart of the innate immune system, but maybe they secrete cytokines that somehow help to stimulate more NK cells? As for the 2008 bio exam, you can't talk about the humoral response because its transplanted tissue - so the cell mediated response should be used. The humoral response is for extracellular pathogens/ antigens e.g. viral particles in the bloodstream or bacteria.
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PopcornTime

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Re: VCE Biology Question Thread
« Reply #10519 on: June 27, 2018, 03:32:48 pm »
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Ok, only because the answers to that question (2008) say that:
• in the cell mediated immune response, T-cell mediated rejection response occurs and T-helper cells activate
cytotoxic T-cells and/or NK (natural killer) cells
• cytotoxic chemicals are produced which destroy foreign cells or macrophages engulf and destroy foreign material.

PopcornTime

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Re: VCE Biology Question Thread
« Reply #10520 on: June 29, 2018, 01:13:17 pm »
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Why would oxygen be a competitive inhibitor of RuBP carboxylase in the light-independent reactions?

PopcornTime

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Re: VCE Biology Question Thread
« Reply #10521 on: June 29, 2018, 01:35:38 pm »
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Hypothalamus secretes TRH which stimulates the anterior pituitary to secrete TSH, which induces the thyroid gland to secrete thyroxine.

So, to control the system, would thyroxine act on the gland that produced it, the thyroid gland, or on the hypothalamus?

nicholas9027

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Re: VCE Biology Question Thread
« Reply #10522 on: June 29, 2018, 10:45:05 pm »
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Hey Guys,
What is the function of Cholesterol in the plasma membrane?
Can i just write : To keep the membrane firm but fluid? or is that too simple (imagine this question was on a vcaa exam)
Thanks in advance
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darkz

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Re: VCE Biology Question Thread
« Reply #10523 on: June 29, 2018, 10:49:48 pm »
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Hey Guys,
What is the function of Cholesterol in the plasma membrane?
Can i just write : To keep the membrane firm but fluid? or is that too simple (imagine this question was on a vcaa exam)
Thanks in advance
Well I'd believe that a question like that would be only one mark, so you could probably keep it pretty brief. Here's what I'd probably write:
Cholesterol helps to maintain the fluidity and stability of the plasma membrane by preventing phospholipid molecules from aggregating in low temperatures and prevents the plasma membrane from disintegrating when temperatures are high

Hypothalamus secretes TRH which stimulates the anterior pituitary to secrete TSH, which induces the thyroid gland to secrete thyroxine.

So, to control the system, would thyroxine act on the gland that produced it, the thyroid gland, or on the hypothalamus?

Well the system works by the negative feedback system. So I looked up a flowchart of it, and it would seem that the thyroid hormones e.g. thyroxine, have a negative feedback on both the hypothalamus and anterior pituitary - although some diagrams only show it having a negative feedback on the anterior pituitary and not the hypothalamus. But nevertheless, therefore, increased thyroxine production would effectively lower the production of TRH and TSH  -> lower levels of thyroxine, to maintain the homeostasis of the body. (The main idea to take out of this I suppose would be that the system is regulated by negative feedback)

Mod edit: merged double post --Calebark
« Last Edit: June 29, 2018, 10:57:18 pm by Calebark »
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PopcornTime

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Re: VCE Biology Question Thread
« Reply #10524 on: June 30, 2018, 10:45:15 am »
0

Hey Guys,
What is the function of Cholesterol in the plasma membrane?
Can i just write : To keep the membrane firm but fluid? or is that too simple (imagine this question was on a vcaa exam)
Thanks in advance


That question was in one of the past vcaa exams and the answer they wanted was simple. Think it was just maintain the stability and fluidity of the plasma membrane.

PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #10525 on: June 30, 2018, 12:30:35 pm »
+2
Why would oxygen be a competitive inhibitor of RuBP carboxylase in the light-independent reactions?
I don’t know the answer to this, I tried to google it but I couldn’t find anything on it either. Don’t worry about it though - it’s not something that you need to know for VCE.
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Scribe

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Re: VCE Biology Question Thread
« Reply #10526 on: July 02, 2018, 01:39:39 pm »
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What's the difference between clonal selection and clonal expansion?

TheBigC

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Re: VCE Biology Question Thread
« Reply #10527 on: July 02, 2018, 02:10:04 pm »
+3
What's the difference between clonal selection and clonal expansion?

I don't intend to be the "sour-mouthed" individual around here, but these types of questions are easily answered with a simple google search... it will be of immense help when, in the future, you need to be proactive and do some of your own research...

IneffableLife

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Re: VCE Biology Question Thread
« Reply #10528 on: July 03, 2018, 11:31:48 pm »
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Is blood clotting first or second line of defense? I have asked teachers who have given me mixed answers.

Springyboy

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Re: VCE Biology Question Thread
« Reply #10529 on: July 04, 2018, 08:55:41 am »
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Is blood clotting first or second line of defense? I have asked teachers who have given me mixed answers.

As per here http://www.vce.bioninja.com.au/aos-2-detecting-and-respond/defence-against-disease/second-line-of-defence.html it's part of the second line of defence as the first line of defence is only intact skin and mucous membranes. Blood clotting occurs via platelets issuing a non-specific response to an intrusion to the body, which is characterised via the second line of defence as the platelets issue a response only in the second line.

Hope that clears things up,

James