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November 26, 2020, 05:58:45 am

Author Topic: VCE Biology Question Thread  (Read 1900157 times)  Share 

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whys

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Re: VCE Biology Question Thread
« Reply #13065 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.

rukayabal

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Re: VCE Biology Question Thread
« Reply #13066 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 #13067 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 #13068 on: October 02, 2020, 09:05:02 pm »
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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 #13069 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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quintonishere

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Re: VCE Biology Question Thread
« Reply #13070 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

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13071 on: October 03, 2020, 05:48:09 pm »
+1
How polygenic inheritances gives rise to continuous variation within a population

Bri MT

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Re: VCE Biology Question Thread
« Reply #13072 on: October 03, 2020, 05:57:45 pm »
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Could someone please explain what this means in the study design?

It saying qualitative means you don't need to use equations or numeric values in general for it

quintonishere

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Re: VCE Biology Question Thread
« Reply #13073 on: October 04, 2020, 10:48:28 pm »
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It saying qualitative means you don't need to use equations or numeric values in general for it
oh i see as in i just need to understand the content in general terms rather than mathematically?

miyukiaura

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Re: VCE Biology Question Thread
« Reply #13074 on: October 05, 2020, 09:48:53 am »
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How does HIV result in the death of helper T cells? Since when it infects the cell and assembles a new virus, the virus buds off and doesn't cause the cell to burst
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Owlbird83

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Re: VCE Biology Question Thread
« Reply #13075 on: October 05, 2020, 10:26:57 am »
+8
How does HIV result in the death of helper T cells? Since when it infects the cell and assembles a new virus, the virus buds off and doesn't cause the cell to burst

This video explains it well:
https://www.youtube.com/watch?v=8gnpnUFNloo
But to summarise it, it's either because
- the cell realises that there are viral transcripts building up and initiates an inflammatory cascades that leads to it self destructing through pyroptosis
- the cell realises that the DNA is being damaged and initates apoptosis
- the proteins (caspases) that are used by viruses to activate their viral proteins, also go on to activate apoptosis in the cell
- Cytotoxic T cells realise the T helper cell is infected and the immune system kills it.
- Many of the T helper cells that are die are not infected. They die because when an infected cell dies via pyroptosis caused by inflammation, the pro-inflammatory particles are released and then affect other T helper cells causing them to undergo pyroptosis.
Disclaimer for people reading, none of this is VCE bio stuff!
« Last Edit: October 05, 2020, 10:28:44 am by Owlbird83 »
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Bri MT

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Re: VCE Biology Question Thread
« Reply #13076 on: October 05, 2020, 07:27:34 pm »
+1
oh i see as in i just need to understand the content in general terms rather than mathematically?

yeah

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13077 on: October 06, 2020, 12:35:07 am »
0
For this question
The largest store of energy in the human body is
A atp
B glycogen
C protein
D triglycerides

Would it be B

whys

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Re: VCE Biology Question Thread
« Reply #13078 on: October 06, 2020, 09:36:25 am »
+2
For this question
The largest store of energy in the human body is
A atp
B glycogen
C protein
D triglycerides

Would it be B
I'd say D, but this isn't knowledge you need for VCE Bio 3/4, this is only something I could answer because of chem. Glycogen is highly branched and stores more energy than ATP (which barely stores any energy at all) and protein, so we can cross them out. Now, it's between glycogen and triglycerides. Fats are a much more efficient manner of energy storage compared to glycogen, as it can store fat for longterm use in high concentrations, and this exceeds the energy that the body is capable of storing in the form of glycogen. Because of this, I would say D is the answer.

Coolgalbornin03Lo

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Re: VCE Biology Question Thread
« Reply #13079 on: October 06, 2020, 01:34:20 pm »
0
Hey guys! For the Extension stage of PCR does this answer seem adequate?

Solution heated to 72 degrees.
Taq polymerase and free nucleotides added. Taq polymerase attaches to primers and catalyses the synthesis of DNA from free nucleotides.

(In the annealing stage I included how primers anneal either end of gene of interest) thanks!!!
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