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July 24, 2019, 08:53:45 am

Author Topic: VCE Biology Question Thread  (Read 1269334 times)  Share 

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darkz

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Re: VCE Biology Question Thread
« Reply #11280 on: November 01, 2018, 08:04:51 am »
+5
Hi,
What do we need to know about mass extinctions? Is it just some of the major causes and what follows?
Also, what would be some of the major causes of mass extinctions? Is it like big changes of climate, like the ice age and stuff?
Thanks!

Yup, so climate change is a big one i.e. changes in sea level etcetera. Another one would be the asteroid collisions which wiped out most of the dinosaurs. You should also know that mass extinctions are followed by a period of adaptive radiation, due to the vast number of unoccupied ecological niches
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PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #11281 on: November 01, 2018, 08:07:58 am »
0
How does B-cell activation work?
Why is IgM the default antibody? Why does it change to IgG later on?
B cells are initially activated by a free antigen (one not presented on MHC) and then they are activated by a Th cell that has been presented with its antigen. Both of these are required for a naive B cell to divide and differentiate.

You don't need to know any of that.
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Robot10

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Re: VCE Biology Question Thread
« Reply #11282 on: November 01, 2018, 08:15:31 am »
0
Why did a wider pelvic girdle make bipedalism harder?


galaxy21

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Re: VCE Biology Question Thread
« Reply #11283 on: November 01, 2018, 08:17:04 am »
0
2. glycoproteins are receptors, but not glycolipids
Thank you!
Also, just wondering, if are glycoproteins the only receptors on the cell surface, or do other molecules act as this as well? Also, what are glycolipids for then? Is it just communication betweeen cells or something?
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darkz

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Re: VCE Biology Question Thread
« Reply #11284 on: November 01, 2018, 08:23:39 am »
+1
Thank you!
Also, just wondering, if are glycoproteins the only receptors on the cell surface, or do other molecules act as this as well? Also, what are glycolipids for then? Is it just communication betweeen cells or something?

According to the nature of biology textbook, "glycolipids on the plasma membrane play a role in tissue recognition", so I'd suppose likewise with glycoproteins, they act as cell surface markers i.e. antigens
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M-D

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Re: VCE Biology Question Thread
« Reply #11285 on: November 01, 2018, 08:36:53 am »
0
ADVICE FOR COMPREHENSION QUESTIONS

What advice would you give for comprehension questions such as Short Answer Question 10 of the 2017 exam or Short Answer Question 10 of the sample exam ?
What is the best way to tackle such questions?

Thanks

galaxy21

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Re: VCE Biology Question Thread
« Reply #11286 on: November 01, 2018, 08:42:36 am »
+2
ADVICE FOR COMPREHENSION QUESTIONS

What advice would you give for comprehension questions such as Short Answer Question 10 of the 2017 exam or Short Answer Question 10 of the sample exam ?
What is the best way to tackle such questions?

Thanks
With questions with big chunks of information, I would quickly skim the info to get a basic idea of what it is about, read through all of the questions so that you know exactly what to look for, and then read through the information again and highlight, possibly in different colours (like for the one in the 2017 exam, you could highlight the parts that SUPPORT the rapid evolution model in one colour, and parts that DON'T support the rapid evolution model in another colour) - this will make the information easier to identify when answering the associated questions.
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starby

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Re: VCE Biology Question Thread
« Reply #11287 on: November 01, 2018, 09:15:43 am »
0
Hey guys
Do we need to know the peptide hormone transduction which involves G proteins?

darkz

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Re: VCE Biology Question Thread
« Reply #11288 on: November 01, 2018, 09:17:52 am »
+4
Hey guys
Do we need to know the peptide hormone transduction which involves G proteins?

No, G protein pathways are not required. You just need to understand the concept of a cascade of events occuring during transduction once the ligand binds to the receptor
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vox nihili

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Re: VCE Biology Question Thread
« Reply #11289 on: November 01, 2018, 09:19:54 am »
+1
No, G protein pathways are not required. You just need to understand the concept of a cascade of events occuring during transduction once the ligand binds to the receptor

Second this. The SS explicitly says that you don't need to know G-protein pathways.
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starby

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Re: VCE Biology Question Thread
« Reply #11290 on: November 01, 2018, 09:25:45 am »
0
Second this. The SS explicitly says that you don't need to know G-protein pathways.


Thanks. Wasn’t sure as I was given notes on the G protein pathway

Robot10

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Re: VCE Biology Question Thread
« Reply #11291 on: November 01, 2018, 09:31:35 am »
0
Why do booster vaccinations have to be given at least 6 months apart?

darkz

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Re: VCE Biology Question Thread
« Reply #11292 on: November 01, 2018, 09:35:43 am »
+4
Why do booster vaccinations have to be given at least 6 months apart?

I did see this on the STAV 2018 paper, and it simply said to allow for the memory cells to fully mature, and I suppose that this is directly attributed to clinical trials which determine the period so that the greatest immune response against the vaccine can occur, so as to maximise the potential strength/ benefit of the vaccine.
« Last Edit: November 01, 2018, 09:37:45 am by darkdzn »
2018: Biology [50 + Prems], Mathematical Methods
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cooperbailey14

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Re: VCE Biology Question Thread
« Reply #11293 on: November 01, 2018, 09:58:19 am »
+1
Why did a wider pelvic girdle make bipedalism harder?
It essentially makes it harder for hominons to keep balance. A less wide and more bowel shaped pelvis shifts the centre of gravity of more or less a single point, allowing bipedalism to occur more easily. When the pelvic girdle is wider, the centre of gravity can shift very easily, making it difficult to be positioned up right whilst standing/walking.
Correct me if I'm wrong!!

Maya24

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Re: VCE Biology Question Thread
« Reply #11294 on: November 01, 2018, 10:04:29 am »
0
Would we need to know about specific plant hormones such as auxin etc?