Login

Welcome, Guest. Please login or register.

March 29, 2024, 01:04:39 am

Author Topic: VCE Biology Question Thread  (Read 3570572 times)  Share 

0 Members and 11 Guests are viewing this topic.

Quantum44

  • Victorian
  • Forum Leader
  • ****
  • Posts: 756
  • Respect: +313
Re: VCE Biology Question Thread
« Reply #9225 on: June 15, 2017, 09:14:31 pm »
+2
What would you say for a question asking you how to stop a disease in some village (relating to herd immunity im assuming) and the answer being antibiotics i would of thought it would be vaccines can someone explain this to me.

Also has anyone had the immunolgy sac i have it tomorrow and im worried bc so much CONTENT  surely they cant test us on all of this

I assume it is because vaccines cannot be used to treat a disease, only to give immunity to a disease beforehand. Therefore antibiotics would be more effective for patients who are already infected.

Don't worry about your SAC. There is a tonne of content in immunology, but I'm sure if you have studied hard, you will do well. :)
UAdel MBBS

vox nihili

  • National Moderator
  • Great Wonder of ATAR Notes
  • *****
  • Posts: 5343
  • Respect: +1447
Re: VCE Biology Question Thread
« Reply #9226 on: June 15, 2017, 09:28:40 pm »
+1
What would you say for a question asking you how to stop a disease in some village (relating to herd immunity im assuming) and the answer being antibiotics i would of thought it would be vaccines can someone explain this to me.

Also has anyone had the immunolgy sac i have it tomorrow and im worried bc so much CONTENT  surely they cant test us on all of this

Just to add to what Quantum44 has already said. You actually protect the population by treating people with antibiotics. Every person you successfully cure is one less person to spread the disease. This particular approach is really critical in a lot of STIs, such as HIV and gonorrhoea.
2013-15: BBiomed (Biochemistry and Molecular Biology), UniMelb
2016-20: MD, UniMelb
2019-20: MPH, UniMelb
2021-: GDipBiostat, USyd

vox nihili

  • National Moderator
  • Great Wonder of ATAR Notes
  • *****
  • Posts: 5343
  • Respect: +1447
Re: VCE Biology Question Thread
« Reply #9227 on: June 17, 2017, 11:37:02 am »
+2
Are complement proteins cytokines? Or are they just proteins working with cytokines? TIA

They're not cytokines. Cytokines are basically paracrines/hormones of the immune system. Complement actually has specific functions, like mediating the death of bacteria or making things tastier for phagocytes.
2013-15: BBiomed (Biochemistry and Molecular Biology), UniMelb
2016-20: MD, UniMelb
2019-20: MPH, UniMelb
2021-: GDipBiostat, USyd

rachellang

  • Fresh Poster
  • *
  • Posts: 1
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #9228 on: June 17, 2017, 09:32:10 pm »
0
Which cells have MHC Class 2 markers? TIA

vox nihili

  • National Moderator
  • Great Wonder of ATAR Notes
  • *****
  • Posts: 5343
  • Respect: +1447
Re: VCE Biology Question Thread
« Reply #9229 on: June 17, 2017, 09:56:11 pm »
0
Which cells have MHC Class 2 markers? TIA

Antigen presenting cells. You could google this.
2013-15: BBiomed (Biochemistry and Molecular Biology), UniMelb
2016-20: MD, UniMelb
2019-20: MPH, UniMelb
2021-: GDipBiostat, USyd

ardria

  • Victorian
  • Forum Regular
  • **
  • Posts: 91
  • Respect: +3
Re: VCE Biology Question Thread
« Reply #9230 on: June 17, 2017, 11:55:46 pm »
+1
Which cells have MHC Class 2 markers? TIA
You should also know that B cells, dendritic cells and macrophages (both phagocytes) are professional antigen presenting cells. Note that cells with MHC I can present foreign antigens too when they become infected.

Have a look at: https://en.wikipedia.org/wiki/Antigen-presenting_cell#Professional (yes I know, wikipedia)

Hiea

  • Trailblazer
  • *
  • Posts: 32
  • Respect: +7
Re: VCE Biology Question Thread
« Reply #9231 on: July 03, 2017, 02:39:33 pm »
0
When a protein folds, does it literally just... fold? In half or something? Sorry for the weird question, I'm just having trouble visualising the process :-\
2018 - 2019 : Biology [45] Japanese SL [45] JLPT N2
2020 - : BMedSc/MD @ Monash University

vox nihili

  • National Moderator
  • Great Wonder of ATAR Notes
  • *****
  • Posts: 5343
  • Respect: +1447
Re: VCE Biology Question Thread
« Reply #9232 on: July 03, 2017, 03:08:01 pm »
+2
When a protein folds, does it literally just... fold? In half or something? Sorry for the weird question, I'm just having trouble visualising the process :-\

I didn't listen to the content of this video, but towards the end it shows an animation of a protein folding.

https://www.youtube.com/embed/yZ2aY5lxEGE

Proteins don't really fold in half as you've described. It's more like origami. A series of deliberate, smaller folds that all conspire to make an exact structure. That's how protein folding works, in essence :)
« Last Edit: July 03, 2017, 03:12:54 pm by vox nihili »
2013-15: BBiomed (Biochemistry and Molecular Biology), UniMelb
2016-20: MD, UniMelb
2019-20: MPH, UniMelb
2021-: GDipBiostat, USyd

ezferns

  • Forum Regular
  • **
  • Posts: 78
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #9233 on: July 03, 2017, 04:52:28 pm »
0
Hey everyone, would a pathogen wiping out members of a population be genetic drift (since it is a chance/bottleneck event) or natural selection (since only those resistant are selected for survival)?

Quantum44

  • Victorian
  • Forum Leader
  • ****
  • Posts: 756
  • Respect: +313
Re: VCE Biology Question Thread
« Reply #9234 on: July 03, 2017, 05:18:11 pm »
+2
Hey everyone, would a pathogen wiping out members of a population be genetic drift (since it is a chance/bottleneck event) or natural selection (since only those resistant are selected for survival)?

Well natural selection is a mechanism for evolution that causes a change in allele frequencies due to differential reproductive success in members of a population, whereas genetic drift is a change in allele frequencies due to a random event. Since the hypothetical disease wipes out a subset of the population not randomly, but based on inherent resistance to the pathogen acquired through genetic mutations, it would have to be natural selection.
UAdel MBBS

ezferns

  • Forum Regular
  • **
  • Posts: 78
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #9235 on: July 03, 2017, 06:39:26 pm »
0
Thankyou, that makes sense :)

Domek

  • Adventurer
  • *
  • Posts: 14
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #9236 on: July 08, 2017, 05:19:15 pm »
0
Hi there, what to write when explaining the purpose of a control group? I read in the Checkpoints that simply stating 'standard of comparison' is not good enough. I used to think that it is 'to ensure that the independent variable is the only factor causing a change in the reuslts', but I'm not so sure any more. Somebody help? Thanks  :)
2016 - 2018: VCE, ATAR - 99.2, Biology - 48, Chemistry - 46
2019 - 2021: Bachelor of Science - University of Melbourne (Biochemistry and Molecular Biology)

vox nihili

  • National Moderator
  • Great Wonder of ATAR Notes
  • *****
  • Posts: 5343
  • Respect: +1447
Re: VCE Biology Question Thread
« Reply #9237 on: July 08, 2017, 05:27:27 pm »
+3
Hi there, what to write when explaining the purpose of a control group? I read in the Checkpoints that simply stating 'standard of comparison' is not good enough. I used to think that it is 'to ensure that the independent variable is the only factor causing a change in the reuslts', but I'm not so sure any more. Somebody help? Thanks  :)

I think your explanation is pretty good. For mine, a control group does serve as a point of comparison so that you can be more confident that your results are truly due to the effect of the IV, and not a confounding variable. I think, perhaps, it might be useful to explicitly state that the control should be, where possible, as similar as it can be to the treatment group and should be exposed to exactly the same conditions as the treatment group, except of course for the IV :)
2013-15: BBiomed (Biochemistry and Molecular Biology), UniMelb
2016-20: MD, UniMelb
2019-20: MPH, UniMelb
2021-: GDipBiostat, USyd

anotherworld2b

  • Forum Leader
  • ****
  • Posts: 747
  • Respect: 0
  • School Grad Year: 2017
Re: VCE Biology Question Thread
« Reply #9238 on: July 10, 2017, 11:16:08 am »
0
I was wondering for a experiment with the aim to test the effect of exercise on heart rate
What would actually happen to the body as the duration of exercise increases?
Would the heart rate increase/decrease? Why would this happen?

vox nihili

  • National Moderator
  • Great Wonder of ATAR Notes
  • *****
  • Posts: 5343
  • Respect: +1447
Re: VCE Biology Question Thread
« Reply #9239 on: July 10, 2017, 11:40:36 am »
+2
I was wondering for a experiment with the aim to test the effect of exercise on heart rate
What would actually happen to the body as the duration of exercise increases?
Would the heart rate increase/decrease? Why would this happen?

Tell us what you think first.
2013-15: BBiomed (Biochemistry and Molecular Biology), UniMelb
2016-20: MD, UniMelb
2019-20: MPH, UniMelb
2021-: GDipBiostat, USyd