Welcome, Guest. Please login or register.

August 21, 2019, 05:01:31 pm

Author Topic: VCE Biology Question Thread  (Read 1307015 times)  Share 

0 Members and 3 Guests are viewing this topic.

PhoenixxFire

  • VIC MVP - 2018
  • Moderator
  • ATAR Notes Superstar
  • *****
  • Posts: 2632
  • Bad puns are how eye roll
  • Respect: +1944
Re: VCE Biology Question Thread
« Reply #10515 on: June 26, 2018, 03:27:06 pm »
+1
Is there a difference between B cell receptors and antibodies?

I assume its just a functional difference; antibodies neutralise antigens, whereas B cell receptors recognise antigens.
Yeah itís just functional. B cell receptors are just antibodies that are embedded in membranes. Note that antibodies also recognise antigens though. Better to say that they allow differentiation/proliferation to occur by binding their complimentary antigen or something like that.
2019: B Environment and Sustainability/B Science @ ANU

Owlbird83

  • Trendsetter
  • **
  • Posts: 187
  • Respect: +164
Re: VCE Biology Question Thread
« Reply #10516 on: June 26, 2018, 05:03:45 pm »
0
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 :)
2018: Biology
2019: Chemistry, Physics, Math Methods, English, Japanese

PopcornTime

  • Forum Obsessive
  • ***
  • Posts: 264
  • Respect: +10
Re: VCE Biology Question Thread
« Reply #10517 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

  • Trendsetter
  • **
  • Posts: 187
  • Respect: +164
Re: VCE Biology Question Thread
« Reply #10518 on: June 26, 2018, 07:05:03 pm »
0
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!
2018: Biology
2019: Chemistry, Physics, Math Methods, English, Japanese

PopcornTime

  • Forum Obsessive
  • ***
  • Posts: 264
  • Respect: +10
Re: VCE Biology Question Thread
« Reply #10519 on: June 27, 2018, 01:20:21 pm »
0
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

  • MOTM: APR 18
  • Forum Obsessive
  • ***
  • Posts: 275
  • Respect: +94
Re: VCE Biology Question Thread
« Reply #10520 on: June 27, 2018, 01:26:38 pm »
0
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.
2018: Biology [50 + Prems], Mathematical Methods
2019: English, Latin, Chemistry, Specialist Mathematics
Free Biology Unit 3/4 Notes

PopcornTime

  • Forum Obsessive
  • ***
  • Posts: 264
  • Respect: +10
Re: VCE Biology Question Thread
« Reply #10521 on: June 27, 2018, 03:32:48 pm »
0
Ok, only because the answers to that question (2008) say that:
ē 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
ē cytotoxic chemicals are produced which destroy foreign cells or macrophages engulf and destroy foreign material.

PopcornTime

  • Forum Obsessive
  • ***
  • Posts: 264
  • Respect: +10
Re: VCE Biology Question Thread
« Reply #10522 on: June 29, 2018, 01:13:17 pm »
0
Why would oxygen be a competitive inhibitor of RuBP carboxylase in the light-independent reactions?

PopcornTime

  • Forum Obsessive
  • ***
  • Posts: 264
  • Respect: +10
Re: VCE Biology Question Thread
« Reply #10523 on: June 29, 2018, 01:35:38 pm »
0
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

  • Adventurer
  • *
  • Posts: 11
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #10524 on: June 29, 2018, 10:45:05 pm »
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
Class of 2018 :)
2019: Monash Science
Open for tutoring inquiries

darkz

  • MOTM: APR 18
  • Forum Obsessive
  • ***
  • Posts: 275
  • Respect: +94
Re: VCE Biology Question Thread
« Reply #10525 on: June 29, 2018, 10:49:48 pm »
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
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 »
2018: Biology [50 + Prems], Mathematical Methods
2019: English, Latin, Chemistry, Specialist Mathematics
Free Biology Unit 3/4 Notes

PopcornTime

  • Forum Obsessive
  • ***
  • Posts: 264
  • Respect: +10
Re: VCE Biology Question Thread
« Reply #10526 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

  • VIC MVP - 2018
  • Moderator
  • ATAR Notes Superstar
  • *****
  • Posts: 2632
  • Bad puns are how eye roll
  • Respect: +1944
Re: VCE Biology Question Thread
« Reply #10527 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 donít know the answer to this, I tried to google it but I couldnít find anything on it either. Donít worry about it though - itís not something that you need to know for VCE.
2019: B Environment and Sustainability/B Science @ ANU

Scribe

  • Forum Regular
  • **
  • Posts: 69
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #10528 on: July 02, 2018, 01:39:39 pm »
0
What's the difference between clonal selection and clonal expansion?

TheBigC

  • Guest
Re: VCE Biology Question Thread
« Reply #10529 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...