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March 28, 2024, 07:15:10 pm

Author Topic: VCE Biology Question Thread  (Read 3570277 times)  Share 

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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13065 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 #13066 on: October 03, 2020, 05:57:45 pm »
+4
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 #13067 on: October 04, 2020, 10:48:28 pm »
0
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 #13068 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 #13069 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 #13070 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 #13071 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 #13072 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.
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Coolgalbornin03Lo

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Re: VCE Biology Question Thread
« Reply #13073 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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tiredandstressed

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Re: VCE Biology Question Thread
« Reply #13074 on: October 06, 2020, 01:44:50 pm »
+2
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!!!
You're response is fine!
Heat the mixture to 72°C for one minute. This will allow Taq polymerase to synthesise a new strand of DNA from the primer using original strands of DNA as a sample

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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13075 on: October 06, 2020, 03:17:33 pm »
+3
For this question would this be a sufficient answer
Explain how size and genetic variation impact on the Risk of extinction.

Genetic variation is necessary in order for evolution to occur. Without genetic variation a population cannot adapt in response to changing environmental conditions and as a result may face increased risk of extinction. Small populations have a smaller gene pool and genetic drift has a greater effect on small populations. Loss of variation as a result of inbreeding prevents speciation from occurring and leads to more homozygotes. The heterozygous advantage is lost and individuals are more likely to have 2 copies of deleterious recessive alleles.

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Re: VCE Biology Question Thread
« Reply #13076 on: October 06, 2020, 07:02:47 pm »
+4
Loss of variation as a result of inbreeding prevents speciation from occurring and leads to more homozygotes.

Huh?
Inbreeding -> no speciation is a weird link to draw and I'm not inclined to think it's an accurate one. I can see why you'd think that, but if organisms are mating with those more similar to them  that would reduce geneflow between subpopulations and therefore be more likely to lead  to speciation rather than preventing it.

Aside from that, I do think you touch on multiple good points.

wingdings2791

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Re: VCE Biology Question Thread
« Reply #13077 on: October 06, 2020, 09:47:02 pm »
0
Hey guys,
For signal transduction, is it true that hydrophobic signals aren't amplified? According to the Heinemann textbook, signals can only be amplified when there is a cascade, so that would be only hydrophilic signals. Thanks for any help.
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SS1314

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Re: VCE Biology Question Thread
« Reply #13078 on: October 06, 2020, 10:41:37 pm »
+4
Hey guys,
For signal transduction, is it true that hydrophobic signals aren't amplified? According to the Heinemann textbook, signals can only be amplified when there is a cascade, so that would be only hydrophilic signals. Thanks for any help.

Yes that's true, hydrophobic signals don't get amplified since the ligand-receptor complex directly acts as a transcription factor, and so is solely responsible for the cellular response.
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WhatisaMeMe

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Re: VCE Biology Question Thread
« Reply #13079 on: October 06, 2020, 11:32:24 pm »
0
Hi
In the study design there is a table about requirements on the poster/practical report and it says 'limitations in data' and 'limitations in method'. What is the difference, what does 'in data' mean?
Thanks
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