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March 29, 2024, 01:16:57 pm

Author Topic: VCE Biology Question Thread  (Read 3571202 times)  Share 

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Jay.C

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Re: VCE Biology Question Thread
« Reply #6855 on: October 29, 2015, 02:08:08 pm »
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Is this a good way to answer a question that says, "explain allopatric speciation".

- geographical barrier prevents gene flow between two populations.
- genetic variation is present in the populations.
- different selection pressures are present, this results in different traits being phenotypically advantageous.
- these traits are passed onto future generations until when reintroduced the two populations could no longer produce fertile, viable offspring.   
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StupidProdigy

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Re: VCE Biology Question Thread
« Reply #6856 on: October 29, 2015, 02:41:19 pm »
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Why is part c 7?
And, if a haploid organism, like a type of male ant for example can produce sperm, how does it do so? It wouldn't be able to undergo mieosis right? Thanks people
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warya

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Re: VCE Biology Question Thread
« Reply #6857 on: October 29, 2015, 02:47:17 pm »
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Why is part c 7?
And, if a haploid organism, like a type of male ant for example can produce sperm, how does it do so? It wouldn't be able to undergo mieosis right? Thanks people

So the mum or whatever gives 4 chromosomes, and the dad gives 3 so 7.
Yep it would produce gametes via mitosis
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BakedDwarf

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Re: VCE Biology Question Thread
« Reply #6858 on: October 29, 2015, 02:56:27 pm »
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Is it basophils or mast cells that release the histamine in normal inflammation? (not hypersensitivity)

Biology24123

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Re: VCE Biology Question Thread
« Reply #6859 on: October 29, 2015, 03:31:49 pm »
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Why is part c 7?
And, if a haploid organism, like a type of male ant for example can produce sperm, how does it do so? It wouldn't be able to undergo mieosis right? Thanks people

Because they are not homologous

warya

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Re: VCE Biology Question Thread
« Reply #6860 on: October 29, 2015, 03:49:17 pm »
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Know this is simple but what is an effector? According to VCAA: Signal transduction can be considered in terms of a stimulus-response model and should be described, in simple terms, as a three-step process: reception (information is received by a cell’s receptor), transduction (information from the receptor is passed on to an effector) and induction/response (various cellular responses are initiated).

Is the effector step the synthesis of second messenger

Could someone please give me a simple definition for signal transduction haha
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heids

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Re: VCE Biology Question Thread
« Reply #6861 on: October 29, 2015, 03:57:21 pm »
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Know this is simple but what is an effector? According to VCAA: Signal transduction can be considered in terms of a stimulus-response model and should be described, in simple terms, as a three-step process: reception (information is received by a cell’s receptor), transduction (information from the receptor is passed on to an effector) and induction/response (various cellular responses are initiated).

Is the effector step the synthesis of second messenger

Could someone please give me a simple definition for signal transduction haha

Effectors are the things that do stuff.  So this step is the 'intermediate' stage between steps 1 and 3 - 1 is binding to the receptor and 3 is the effector actually doing something, so this is the message being passed from the receptor to the effector (which could be an enzyme, a transcription factor, or anything else that actually causes cellular responses) - and yeah, this happens through second messengers.

VCAA definition: the series of events that occur after the receipt of a specific signal and which result in a response.
So: the stuff that happens when we get a signal, that leads to the cell responding to the signal.
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Biology24123

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Re: VCE Biology Question Thread
« Reply #6862 on: October 29, 2015, 03:59:44 pm »
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Effectors are the things that do stuff.  So this step is the 'intermediate' stage between steps 1 and 3 - 1 is binding to the receptor and 3 is the effector actually doing something, so this is the message being passed from the receptor to the effector (which could be an enzyme, a transcription factor, or anything else that actually causes cellular responses) - and yeah, this happens through second messengers.

VCAA definition: the series of events that occur after the receipt of a specific signal and which result in a response.
So: the stuff that happens when we get a signal, that leads to the cell responding to the signal.

How is reduced eyebrow ridges and a wider pelvis a selective advantage?

BakedDwarf

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Re: VCE Biology Question Thread
« Reply #6863 on: October 29, 2015, 04:11:34 pm »
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Each pyruvate in the Krebs cycle is broken down to form 3 carbon dioxide molecules, 1 ATP and 5 loader acceptor molecules... right?

Would I get a mark for this definition of pathogen?
Pathogen is a cellular or non-cellular disease-causing agent
« Last Edit: October 29, 2015, 04:30:32 pm by BakedDwarf »

THEBEAST

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Re: VCE Biology Question Thread
« Reply #6864 on: October 29, 2015, 04:32:41 pm »
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What is a good definition for "index fossil" and "radiometric dating"?
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StupidProdigy

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Re: VCE Biology Question Thread
« Reply #6865 on: October 29, 2015, 04:34:24 pm »
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Could someone please elaborate on this question, I was stuck between b and c. Thanks
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THEBEAST

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Re: VCE Biology Question Thread
« Reply #6866 on: October 29, 2015, 04:36:30 pm »
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What is a good definition for "index fossil" and "radiometric dating"?

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Biology24123

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Re: VCE Biology Question Thread
« Reply #6867 on: October 29, 2015, 04:37:16 pm »
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Could someone please elaborate on this question, I was stuck between b and c. Thanks

I would say it's B because histamine causes vasodilation

BakedDwarf

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Re: VCE Biology Question Thread
« Reply #6868 on: October 29, 2015, 04:46:00 pm »
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What is a good definition for "index fossil" and "radiometric dating"?

Radiometric dating determines the absolute age of the fossils via the known radioactive decay of the parent, unstable isotope to the daughter, stable isotope (such as carbon-14 to carbon-12)

Not too sure about index fossil

Biology24123

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Re: VCE Biology Question Thread
« Reply #6869 on: October 29, 2015, 04:53:21 pm »
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What is a good definition for "index fossil" and "radiometric dating"?

Fossils that have a known age and are widespread, used for relative dating