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March 29, 2024, 07:04:28 am

Author Topic: VCE Biology Question Thread  (Read 3570906 times)  Share 

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homeworkisapotato

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Re: VCE Biology Question Thread
« Reply #13050 on: October 01, 2020, 12:22:57 pm »
+1
For this question why can't it be c
I think motility is ability for the organism to move around without help, and C says that the organism is not able to do so, so it is most likely not an animal.
What is the answer?
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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13051 on: October 01, 2020, 12:27:47 pm »
+4
But there are animals that can’t move around like sponges

I don’t know what the answer is. I don’t actually  have the answers for this

homeworkisapotato

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Re: VCE Biology Question Thread
« Reply #13052 on: October 01, 2020, 12:29:50 pm »
+2
But there are animals that can’t move around like sponges

I don’t know what the answer is. I don’t actually  have the answers for this
That's very true, you could be right then!
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Owlbird83

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Re: VCE Biology Question Thread
« Reply #13053 on: October 01, 2020, 12:32:04 pm »
+5
That's very true, you could be right then!
Yeah, I would say C, all the other options are wrong
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miyukiaura

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Re: VCE Biology Question Thread
« Reply #13054 on: October 02, 2020, 10:53:10 am »
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Slightly confused on why boosters are needed. I initially thought they were required to maintain the high levels of antibodies required for immunity against a certain disease, but the answers to a trial exam said that boosters are needed to produce more B memory cells as memory cells are short-lived. Don't memory cells last for long periods of time?

Thank you
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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13055 on: October 02, 2020, 11:32:20 am »
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Booster shots are administered to increase the amount of memory B cells for a specific antigen. Memory B cells gradually decline over time and booster shots can also cover any new strains or mutations

miyukiaura

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Re: VCE Biology Question Thread
« Reply #13056 on: October 02, 2020, 11:41:51 am »
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I've read that memory cells remain in lymphoid tissue for decades or even an entire lifetime so how would they gradually decline? Does it depend on the type of pathogen you're dealing with?
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Owlbird83

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Re: VCE Biology Question Thread
« Reply #13057 on: October 02, 2020, 12:22:51 pm »
+6
I've read that memory cells remain in lymphoid tissue for decades or even an entire lifetime so how would they gradually decline? Does it depend on the type of pathogen you're dealing with?
Although they have a long lifespan, memory cells can still die like any other cell, they aren't immortal, so the numbers would decrease overtime. I don't think it would depend on the pathogen, I googled it, and you wouldn't need to know this for bio, but I read that it depends on the type of vaccine (whether it's live/attenuated or inactivated, or subunits etc) for how much immunity they create and whether boosters are needed.
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ErnieTheBirdi

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Re: VCE Biology Question Thread
« Reply #13058 on: October 02, 2020, 08:17:50 pm »
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Could anyone tell me what would definitely be on an Evolution SAC? and how would I answer a natural selection question and get the full mark for it? Thanks Y'all

whys

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Re: VCE Biology Question Thread
« Reply #13059 on: October 02, 2020, 08:37:37 pm »
+4
Could anyone tell me what would definitely be on an Evolution SAC? and how would I answer a natural selection question and get the full mark for it? Thanks Y'all
We wouldn't be able to tell you, since it's your teacher who is writing the SAC and they could put whatever they want on it. What you'd generally need in a natural selection question is as follows:
1. There is pre-existing variation within a population that is genetically determined
2. A selecting agent (or selection factor) makes one form/phenotype more likely to survive and therefore more likely to reproduce than other forms/phenotypes
3. The selection pressure continues over a number of successive generations
4. A significant change in allele frequency is established
You'd have to link each step to the scenario provided - if it's just general and you exactly copy the above you wouldn't get the marks because you wouldn't have linked it to the specific question provided.
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rukayabal

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Re: VCE Biology Question Thread
« Reply #13060 on: October 02, 2020, 08:41:46 pm »
+4
Could anyone tell me what would definitely be on an Evolution SAC? and how would I answer a natural selection question and get the full mark for it? Thanks Y'all


Well in my last evolution Sac, there were questions on determining whether two animals are species, application questions on the processes of natural selection and allopatric speciation (I daresay selective breeding may come up as well) . There was also a question about a phylogenetic tree: determining the closest species, also an application question on a frameshift mutation causing a disease that resulted in the production of dysfunctional proteins etc, you must also keep in mind the functionality of a protein if there was such a major mutation. My biology teacher decided not to include human evolution, but each school/teacher is different.

But if I was you, I would be focusing on how to approach the 4 to 3 mark questions  in particular, as it is very easy to lose valuable marks for not including key terms such as "geographical barrier"  and "advantageous phenotype".
 
Good luck  :)

ErnieTheBirdi

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Re: VCE Biology Question Thread
« Reply #13061 on: October 02, 2020, 08:58:58 pm »
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Would allopatric speciation and stuff be on an Evolution SAC? Also, how would I answer a question to get full marks (3-4 mark questions)?

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13062 on: October 02, 2020, 09:05:02 pm »
+4
it would depend on the question but you would have to mention that the populations are geographically separated resulting in reproductive isolation, no gene flow and link it to the question

tiredandstressed

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Re: VCE Biology Question Thread
« Reply #13063 on: October 03, 2020, 12:34:30 am »
+4
Would allopatric speciation and stuff be on an Evolution SAC? Also, how would I answer a question to get full marks (3-4 mark questions)?
1.   Variation in the initial population
2.   Geographic isolation (a barrier that separates the population)
3.   Local selection pressures (leading initially to subspeciation, SPECIFY the selection pressure in the scenario)
4.   Mutations and genetic drift produce sufficient difference that the members of the two populations are incapable of interbreeding to produce fertile offspring, therefore new species arise
This would suffice 3-4 marks
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Re: VCE Biology Question Thread
« Reply #13064 on: October 03, 2020, 05:16:23 pm »
0
Could someone please explain what this means in the study design?
Quote
qualitative treatment of polygenic inheritance as contributing to continuous variation in a population