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March 29, 2024, 07:46:31 am

Author Topic: VCE Biology Question Thread  (Read 3570942 times)  Share 

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PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #10665 on: September 20, 2018, 09:31:27 am »
+3
Is RNA polymerase technically a transcription factor?
I would say no. Transcription factors alter the rate of transcription, RNA polymerase actually does the transcription. I suppose you could count that as altering it because without it the rate of transcription would be 0 but I’d still say it’s not a transcription factor.
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vox nihili

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Re: VCE Biology Question Thread
« Reply #10666 on: September 20, 2018, 11:49:01 am »
+2
I would say no. Transcription factors alter the rate of transcription, RNA polymerase actually does the transcription. I suppose you could count that as altering it because without it the rate of transcription would be 0 but I’d still say it’s not a transcription factor.

I agree with this. Definitely not a transcription factors. Transcription factors are basically things that help RNA polymerase work (therefore RNA pol itself is not a TF).
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PopcornTime

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Re: VCE Biology Question Thread
« Reply #10667 on: September 20, 2018, 11:01:46 pm »
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I agree with this. Definitely not a transcription factors. Transcription factors are basically things that help RNA polymerase work (therefore RNA pol itself is not a TF).

Does this mean transcription factors wouldn't bind to the promoter region?

Cause in the 2017 sample exam it says transcription factors bind to the promoter region (multiple choice question).

Sine

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Re: VCE Biology Question Thread
« Reply #10668 on: September 20, 2018, 11:54:25 pm »
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Does this mean transcription factors wouldn't bind to the promoter region?

Cause in the 2017 sample exam it says transcription factors bind to the promoter region (multiple choice question).
TF's still binds to the promoter region of DNA.

A protein (or anything) binding to DNA is not what defines it is a TF.

fruitbowl34

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Re: VCE Biology Question Thread
« Reply #10669 on: September 21, 2018, 08:05:43 pm »
0
Hello everyone! I had a few questions regarding these 2 dotpoints:
-  major trends in hominin evolution from the genus Australopithecus to the genus Homo including structural,
functional and cognitive changes and the consequences for cultural evolution. I missed the class where we discussed this dotpoint and my teacher only provided me with the structural changes, but what are the functional and cognitive changes? and what exactly is cultural evolution and it's consequences?

•    the human fossil record as an example of a classification scheme that is open to interpretations that are
contested, refined or replaced when new evidence challenges them or when a new model has greater
explanatory power, including whether Homo sapiens and Homo neanderthalensis interbred and the placement
of the Denisovans into the Homo evolutionary tree. For this one, I was wondering how they would assess this in an exam and what I need to gather from this dotpoint
Thanks so much!!

Azim.m

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VCE Biology Question Thread
« Reply #10670 on: September 22, 2018, 06:17:36 am »
0
Does anaerobic respiration  in human cells produce carbon dioxide ?

Qwerty1234qwerty

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Re: VCE Biology Question Thread
« Reply #10671 on: September 22, 2018, 07:49:41 am »
0
In human cells lactic acid is only produced by anaerobic respiration,not CO2

PopcornTime

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Re: VCE Biology Question Thread
« Reply #10672 on: September 22, 2018, 10:47:55 am »
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TF's still binds to the promoter region of DNA.

A protein (or anything) binding to DNA is not what defines it is a TF.

How would it help RNA polymerase to work?

TheBigC

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Re: VCE Biology Question Thread
« Reply #10673 on: September 22, 2018, 12:52:47 pm »
+3
How would it help RNA polymerase to work?

There are a variety of methods by which transcription factors can facilitate RNA Polymerase's function. A prominent example involves the development of a transcription initiation complex, wherein TFs will bind to enhancer and promoter regions on the DNA which will provide facility for RNA Polymerase to bind...
« Last Edit: September 22, 2018, 12:54:40 pm by TheBigC »

PopcornTime

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Re: VCE Biology Question Thread
« Reply #10674 on: September 22, 2018, 04:55:22 pm »
+1
There are a variety of methods by which transcription factors can facilitate RNA Polymerase's function. A prominent example involves the development of a transcription initiation complex, wherein TFs will bind to enhancer and promoter regions on the DNA which will provide facility for RNA Polymerase to bind...


Cheers!

So, just to confirm:
- transcription factors can bind to the promoter region to facilitate RNA polymerase's role
- or TFs can bind to the operator region and prevent RNA polymerase from binding to promoter

PopcornTime

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Re: VCE Biology Question Thread
« Reply #10675 on: September 23, 2018, 12:26:35 pm »
0
Why do we use STR regions for DNA profiling?


PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #10676 on: September 23, 2018, 07:39:24 pm »
+7
Hello everyone! I had a few questions regarding these 2 dotpoints:
-  major trends in hominin evolution from the genus Australopithecus to the genus Homo including structural,
functional and cognitive changes and the consequences for cultural evolution. I missed the class where we discussed this dotpoint and my teacher only provided me with the structural changes, but what are the functional and cognitive changes? and what exactly is cultural evolution and it's consequences?
I'm not really sure on functional changes - I didn't really understand this back when I originally learnt about it.
Cognitive changes will just be referring to increased intelligence.
Cultural evolution is just the passing down of knowledge, rather than each individual having to learn for itself it can be taught things, therefore that individual has time to learn completely new things which it can then pass down, rather than just learning the same things its parents did and then dying. Over time this results in lots and lots of accumulated knowledge.

I think what this dot point is getting at is that structural evolution (increased cranium capacity) allowed for bigger brains (potentially this is functional change??) which made them smarter (cognitive change) which allowed them to learn and teach others (cultural evolution)

•    the human fossil record as an example of a classification scheme that is open to interpretations that are
contested, refined or replaced when new evidence challenges them or when a new model has greater
explanatory power, including whether Homo sapiens and Homo neanderthalensis interbred and the placement
of the Denisovans into the Homo evolutionary tree. For this one, I was wondering how they would assess this in an exam and what I need to gather from this dotpoint
Thanks so much!!
I think all you'd need to know for this would be about why the human fossil record is incomplete (fossilisation being rare, finding fossils being rare etc.), the theories for the evolution of humans, and evidence that suggests that denisovans interbred (DNA being found in some modern human populations). On our exam last year we got a question about Denisovans, I can't remember what it was about exactly but it might be worth having a look at it.

So, just to confirm:
- transcription factors can bind to the promoter region to facilitate RNA polymerase's role
- or TFs can bind to the operator region and prevent RNA polymerase from binding to promoter
In eukaryotes TF's bind to the promoter region, in prokaryotes they bind to the operator region

Why do we use STR regions for DNA profiling?
They're highly variable regions, so the chances of peoples being the same are low - hence they can be used to create a unique DNA profile (sort of like why we use fingerprints)
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missile

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Re: VCE Biology Question Thread
« Reply #10677 on: September 24, 2018, 07:31:05 pm »
0
Can physical fossils be dated using C-14 dating where the original organic matter has decomposed, and the mineralised cast remains? For example like in the case of a fossilised skeleton from 7000 years ago where original bone is unlikely to remain?
Thanks
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PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #10678 on: September 24, 2018, 07:52:50 pm »
+2
Can physical fossils be dated using C-14 dating where the original organic matter has decomposed, and the mineralised cast remains? For example like in the case of a fossilised skeleton from 7000 years ago where original bone is unlikely to remain?
Thanks
Nope. Carbon dating is used by measuring the rate at which an organic compound decays - if there’s no organic material left then there won’t be an organic compound there. Carbon-14 dating can be used up to 50000 years, but only if there’s organic material to test.
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peachxmh

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Re: VCE Biology Question Thread
« Reply #10679 on: September 24, 2018, 10:30:18 pm »
0
When B-cells encounter an antigen, does the antigen bind to an antibody OR another receptor on the B-cell, before being engulfed and presented on the B-cell's MHC-II marker? Does the same thing apply to allergens?
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