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October 22, 2020, 12:44:42 am

Author Topic: VCE Biology Question Thread  (Read 1844453 times)  Share 

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Owlbird83

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Re: VCE Biology Question Thread
« Reply #13020 on: September 27, 2020, 08:14:24 pm »
+6
Hey! For plant barriers, is it enough to know physical and chemical barriers?
For physical I remember cellulose, bark, and waxy cuticles of leaves and for chemical I know oxalic acid (substance excreted and is toxic when ingested), phenol (secreted by wounded plants which repel/kill microorganisms), and saponin which disrupts the membrane of fungi.
Are there any for each you would recommend knowing?
Yeah, that's all you'd need to know for plant barriers  :)

I think low genetic diversity supports the theory because it supports that there was consistent gene flow between different populations of H. Sapiens, which helped them all evolve into H. Sapiens in the end.
Ooh cool thank you!  ;D
« Last Edit: September 27, 2020, 08:16:00 pm by Owlbird83 »
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Coolgalbornin03Lo

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Re: VCE Biology Question Thread
« Reply #13021 on: September 28, 2020, 12:18:34 pm »
0
For the genetic coding table do we put mRNA in there? Or do we use the coding strand of DNA but just convert all the thymines to URACIL?
I was previously known as “CoolgalborninLo” I’m sure you’ve seen me sauntering around the forums.
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tiredandstressed

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Re: VCE Biology Question Thread
« Reply #13022 on: September 28, 2020, 12:38:37 pm »
+3
For the genetic coding table do we put mRNA in there? Or do we use the coding strand of DNA but just convert all the thymines to URACIL?
Should always be transcribing the template strand :)
Refer to the 2002 exam Section B Q4
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Coolgalbornin03Lo

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Re: VCE Biology Question Thread
« Reply #13023 on: September 28, 2020, 01:40:16 pm »
0
Should always be transcribing the template strand :)
Refer to the 2002 exam Section B Q4

What does that mean? That what we read in the table is the mRNA or the opposite of mRNA. I don’t understand
I was previously known as “CoolgalborninLo” I’m sure you’ve seen me sauntering around the forums.
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-Lilac-

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Re: VCE Biology Question Thread
« Reply #13024 on: September 28, 2020, 01:53:08 pm »
+3
What does that mean? That what we read in the table is the mRNA or the opposite of mRNA. I don’t understand

You can convert the mRNA into the amino acid sequence using the codon table.

I think they were just saying that the mRNA is the opposite of the template strand but in RNA not DNA. Thus, to get the mRNA you need to transcribe the template strand and not the coding strand.
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tiredandstressed

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Re: VCE Biology Question Thread
« Reply #13025 on: September 28, 2020, 02:24:18 pm »
+3
What does that mean? That what we read in the table is the mRNA or the opposite of mRNA. I don’t understand
Person above is right
1. Transcribe the template strand = mRNA
2. Use mRNA in the codon table
3. Write out the sequence of amino acids
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strawberryfadoodle

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Re: VCE Biology Question Thread
« Reply #13026 on: September 28, 2020, 03:00:24 pm »
0
Some pictures from past VCAA bio exams are under copyright restrictions and I can't see them. Does anyone happen to know where I can find these pictures?

strawberryfadoodle

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Re: VCE Biology Question Thread
« Reply #13027 on: September 28, 2020, 03:05:07 pm »
0
Are there any threads on here that list the questions from past VCAA exams that are no longer relevant to this year's study design?

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13028 on: September 28, 2020, 03:46:11 pm »
+3
No I don’t think there is but if you are familiar with your study design you should be able to identify if a question is irrelevant

Harrycc3000

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Re: VCE Biology Question Thread
« Reply #13029 on: September 28, 2020, 04:31:36 pm »
0
Hi guys,
Can anyone explain the difference between the social and ethical implications? They kind of seem similar to me and I haven't seen anything that has definite definitions or explanations for them.



Thanks
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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13030 on: September 28, 2020, 05:08:00 pm »
+6
Ethical issues relates to what is morally right or wrong

Social implications is more about its effect on society as a whole

homeworkisapotato

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Re: VCE Biology Question Thread
« Reply #13031 on: September 28, 2020, 06:32:05 pm »
+2
Adding onto chocolatepistachio, social implications also revolves around the economy. For example, genetically modified crops being distributed throughout the world may cancel out the need for normal crops, widening the gap between poor countries which thrive on their agriculture, and the richer countries which will grow the GM crops. Also, biotech companies may charge farmers very expensive seeds every year for harvest, which the farmers may not be able to pay.

Ethical issues refer to things like humans playing 'God' by changing the natural way of organisms, and in tests like genetic screening who has access to the data, the baby itself has not given consent, etc.
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homeworkisapotato

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Re: VCE Biology Question Thread
« Reply #13032 on: September 28, 2020, 07:29:08 pm »
0
Hey everyone! I've been doing exams and I'm averaging about late 80's to early 90's so I've been dedicating some time to honing my weaknesses. Even though I get the answers right in the practice questions, for some reason I get them wrong in the exams and I feel as though my practice isn't really helping and I'm just plateauing. I'm slowly losing motivation because I cannot see a clear improvement. Any advice?
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Harrycc3000

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Re: VCE Biology Question Thread
« Reply #13033 on: September 28, 2020, 08:02:04 pm »
+4
Hey everyone! I've been doing exams and I'm averaging about late 80's to early 90's so I've been dedicating some time to honing my weaknesses. Even though I get the answers right in the practice questions, for some reason I get them wrong in the exams and I feel as though my practice isn't really helping and I'm just plateauing. I'm slowly losing motivation because I cannot see a clear improvement. Any advice?
tbh i'm in the exact same position lol. Its a bit frustrating but I think its important not to focus on the score of your practice exams and mostly use them as a way to improve the way you approach questions or just as you said hone in on your weakness and fill in knowledge gaps. Also I think some company papers have some dodgy questions so even if you get those answers wrong I wouldn't  worry about it too much. I've personally started tracking how I get my answers wrong to try and improve my strategy for the exams, so I kind of put in all my lost marks into four categories (Stupid mistakes, Didn't know that bit of the content, didn't elaborate on the right things and misinterpreted the questions) to see what I need to focus on doing more in the subsequent practice exams I do (focus more on what the question is asking for for interpretation, underlying key words for stupid mistakes, focusing on what's going to be relevant for the answer for elaboration etc.). I'm thinking that going thru more practice exams with that mentality might help and improve my approach to exams and it might help yours. Yeah anyway im in the same boat as you and just trying to find ways to get over that plateau lol.
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homeworkisapotato

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Re: VCE Biology Question Thread
« Reply #13034 on: September 28, 2020, 08:16:43 pm »
+1
Thank you Harry for your lengthy and detailed response! You're absolutely right that we shouldn't fixate on our scores and should use them as a basis for improvement!

I also have this exam tracker which I note the number of marks I lose in each topic and why I lose them. I usually get the questions wrong because silly mistakes or I misinterpreted the questions because the company exam wording is sometimes really weird. Practice questions are just not helping for some reason so do you all think that just doing more practice exams will help? The thing is because of lockdown, I can't print any exams and I have to look at them on my computer while answering questions. Is that going to severely impact me for the final exam?
« Last Edit: September 28, 2020, 08:18:27 pm by homeworkisapotato »
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