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March 29, 2024, 04:48:28 am

Author Topic: VCE Biology Question Thread  (Read 3570779 times)  Share 

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Bri MT

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Re: VCE Biology Question Thread
« Reply #12975 on: September 21, 2020, 01:09:01 pm »
+5
thanks

i'm not sure how to answer this question
why do you think the hawk, although a descendent of the most recent common ancestor, is not included in the dinosaur group

 

This is more of a description than a way you would need to answer it but here are some thoughts:

It's fairly common for people to group things in paraphyletic categories (i.e. not include all descendants of a common ancestor together) e.g. people don't consider birds reptiles. In the past, morphology based classification was pretty common & this is still informally used frequently. Additionally with dinosaurs you have the consideration that people tend to think of those as existing on a particular temporal scale (in the past, not as extant species)

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #12976 on: September 21, 2020, 04:52:12 pm »
0
why are protista paraphyletic whereas the other kingdoms are monophyletic

Bri MT

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Re: VCE Biology Question Thread
« Reply #12977 on: September 21, 2020, 06:47:24 pm »
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why are protista paraphyletic whereas the other kingdoms are monophyletic

I'm not really sure what your question is but protists are basically an "other" group which captures a bunch of eukaryotes. Are you asking about the history of the term?

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #12978 on: September 21, 2020, 07:02:01 pm »
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Ah no

I was wondering why protista group would be considered paraphyletic whereas fungi, Animalia and plantae are monophyletic

homeworkisapotato

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Re: VCE Biology Question Thread
« Reply #12979 on: September 21, 2020, 08:22:01 pm »
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Ah no

I was wondering why protista group would be considered paraphyletic whereas fungi, Animalia and plantae are monophyletic
It's because scientists believe that protists do not share a common ancestor with animalia and plantae.
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Bri MT

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Re: VCE Biology Question Thread
« Reply #12980 on: September 22, 2020, 09:36:28 am »
+2
Ah no

I was wondering why protista group would be considered paraphyletic whereas fungi, Animalia and plantae are monophyletic

It's because scientists believe that protists do not share a common ancestor with animalia and plantae.

You're thinking along the right lines but not quite there. Something being paraphyletic doesn't mean there isn't a shared common ancestor, it means you're talking about a group which doesn't include all of the descendants of the most recent shared common ancestor.

refortyp

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Re: VCE Biology Question Thread
« Reply #12981 on: September 22, 2020, 02:32:44 pm »
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Do we need to know about gene therapy for the 2020 exam? I've been doing a few of the past exams and they've mentioned it, and I'm not sure whether we need to know something specific for it, or whether it's just the idea of using DNA technology to change faulty genes?

Thanks!

Coolgalbornin03Lo

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Re: VCE Biology Question Thread
« Reply #12982 on: September 22, 2020, 07:54:00 pm »
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Do we need to know about gene therapy for the 2020 exam? I've been doing a few of the past exams and they've mentioned it, and I'm not sure whether we need to know something specific for it, or whether it's just the idea of using DNA technology to change faulty genes?

Thanks!

I think we just need to know a few examples of social, biological and ethical implications- at least that’s all I learnt in class :)

I have a question from the 2012 Bio Exam 1. The question asks why pig insulin could be used to replace human insulin. I answered “the sequence of amino acids at 8,9,10 is that same as in humans so would code for the same protein which gives the polypeptide the same properties as the human insulin proteins”

However vcaa answered that the “shape/structure should be most similar to the human insulin” should I give myself 1 mark, 2 marks or none??
I’m leaning towards no marks as I said same amino acids at 8,9,10 instead of “amino acid of alpha chain” like they said.
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darkz

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Re: VCE Biology Question Thread
« Reply #12983 on: September 22, 2020, 08:07:53 pm »
+5
I think we just need to know a few examples of social, biological and ethical implications- at least that’s all I learnt in class :)

I have a question from the 2012 Bio Exam 1. The question asks why pig insulin could be used to replace human insulin. I answered “the sequence of amino acids at 8,9,10 is that same as in humans so would code for the same protein which gives the polypeptide the same properties as the human insulin proteins”

However vcaa answered that the “shape/structure should be most similar to the human insulin” should I give myself 1 mark, 2 marks or none??
I’m leaning towards no marks as I said same amino acids at 8,9,10 instead of “amino acid of alpha chain” like they said.

In my opinion, saying 8,9,10 instead of alpha chain is not a problem - you're still identifying the similarity which is the idea of the question. The only problem I'd have with your answer is that you say it would code for the same 'protein', which isn't entirely true since the beta chain isn't the same. It would've been better to say they it codes for the same amino acids in relation to the 8,9,10 (or alpha), which in turn causes etc. So I'd probably just give it 1mk.
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homeworkisapotato

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Re: VCE Biology Question Thread
« Reply #12984 on: September 23, 2020, 03:18:48 pm »
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Hey guys!
I was wondering for allopatric speciation would I still get a mark if I say 'the river separates two populations of blah blah with no gene flow between the population' instead of 'the river acts as a geographical barrier between the two populations'? Do I have to mention 'geographical barrier' to get a mark?
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darkz

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Re: VCE Biology Question Thread
« Reply #12985 on: September 23, 2020, 03:25:20 pm »
+6
Hey guys!
I was wondering for allopatric speciation would I still get a mark if I say 'the river separates two populations of blah blah with no gene flow between the population' instead of 'the river acts as a geographical barrier between the two populations'? Do I have to mention 'geographical barrier' to get a mark?

I'd lean towards yes, I'd give you the mark since you've identified the concepts behind what the question is asking i.e. you've essentially described what a geographical barrier is and its purpose. However, now that you know, next time try to include it in your answer so you don't risk losing the mark.
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homeworkisapotato

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Re: VCE Biology Question Thread
« Reply #12986 on: September 23, 2020, 03:27:40 pm »
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I'd lean towards yes, I'd give you the mark since you've identified the concepts behind what the question is asking i.e. you've essentially described what a geographical barrier is and its purpose. However, now that you know, next time try to include it in your answer so you don't risk losing the mark.
Thank you!! When I mention 'geographical barrier' do I have to talk about there being no gene flow?
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darkz

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Re: VCE Biology Question Thread
« Reply #12987 on: September 23, 2020, 03:29:26 pm »
+5
Thank you!! When I mention 'geographical barrier' do I have to talk about there being no gene flow?

Yes, I would still describe what it is/its purpose.
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Coolgalbornin03Lo

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Re: VCE Biology Question Thread
« Reply #12988 on: September 23, 2020, 05:36:34 pm »
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Is the oxygen produced in the light dependant reaction, the same oxygen which is the final receptor of H+ ions in the electron transport chain?

Also do we put oxygen as an input for ETC or not?

Also I was wondering how to develop an understand of bio which will lead to you to a high score? For unit 3 I feel like I understand it and how all the processes connect but for unit 4 I can answer the exams but it seems a bit shaky. Or should I just keep doing exams and go in depth on my “problem” areas?
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homeworkisapotato

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Re: VCE Biology Question Thread
« Reply #12989 on: September 23, 2020, 07:03:41 pm »
+1
Is the oxygen produced in the light dependant reaction, the same oxygen which is the final receptor of H+ ions in the electron transport chain?
I've been told that usually it diffuses out of the cell

Also do we put oxygen as an input for ETC or not?
Yes

Also I was wondering how to develop an understand of bio which will lead to you to a high score? For unit 3 I feel like I understand it and how all the processes connect but for unit 4 I can answer the exams but it seems a bit shaky. Or should I just keep doing exams and go in depth on my “problem” areas?
I'd say spend some time on your problem areas and then go back to practice exams
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