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March 28, 2024, 08:44:46 pm

Author Topic: VCE Biology Question Thread  (Read 3570353 times)  Share 

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missile

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Re: VCE Biology Question Thread
« Reply #10995 on: October 27, 2018, 01:57:49 pm »
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Hi,

So I had a go at describing the process resulting in the diversification of beaks in finches in terms of natural selection/adaptive radiation:
1. Genetic variation due to mutations in the BMP4 master gene resulted in variation in the beak phenotypes
2. Vacant niches could be filled by various members; different seed size and type in each acted as a selection pressure making it more likely those with suited beak phenotypes would survive and reproduce in each
3. Over generations, these respective alleles were passed on within each population due to the food types in each niche remaining unchanged, with minimal gene flow between populations, resulting in the increased diversification of beak types and speciation via adaptive radiation in the finches

Is that right or have I got the wrong idea?

Thanks in advance
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Scribe

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Re: VCE Biology Question Thread
« Reply #10996 on: October 27, 2018, 02:55:02 pm »
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Hey,

I have a couple of questions.
1) What is the level of detail we need to know about intrinsic and extrinsic apoptosis? Do we need to know the different types of caspases?
2) Is this definition for caspases correct? Are there any things you would add?
Caspases are a group of enzymes that drive the apoptotic death process by cleaving specific proteins, for example in the cytoplasm or nucleus, leading to cell death.
3) When outlining transcription, should we mention post-transcriptional modifications?

Thanks!

C14M8S

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Re: VCE Biology Question Thread
« Reply #10997 on: October 27, 2018, 03:28:48 pm »
+4
Hey,

I have a couple of questions.
1) What is the level of detail we need to know about intrinsic and extrinsic apoptosis? Do we need to know the different types of caspases?
2) Is this definition for caspases correct? Are there any things you would add?
Caspases are a group of enzymes that drive the apoptotic death process by cleaving specific proteins, for example in the cytoplasm or nucleus, leading to cell death.
3) When outlining transcription, should we mention post-transcriptional modifications?

Thanks!
1) You don't need to know the different sorts of caspases, just know that caspases exist.
2) That's it.
3) Yes.

Hi,

So I had a go at describing the process resulting in the diversification of beaks in finches in terms of natural selection/adaptive radiation:
1. Genetic variation due to mutations in the BMP4 master gene resulted in variation in the beak phenotypes
2. Vacant niches could be filled by various members; different seed size and type in each acted as a selection pressure making it more likely those with suited beak phenotypes would survive and reproduce in each
3. Over generations, these respective alleles were passed on within each population due to the food types in each niche remaining unchanged, with minimal gene flow between populations, resulting in the increased diversification of beak types and speciation via adaptive radiation in the finches

Is that right or have I got the wrong idea?

Thanks in advance
That's the right idea.
« Last Edit: October 27, 2018, 03:33:58 pm by C14M8S »
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EllingtonFeint

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Re: VCE Biology Question Thread
« Reply #10998 on: October 27, 2018, 04:30:55 pm »
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What exactly is the purpose of the primers in PCR?
So they attach to the complementary DNA strand, but why???
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Sine

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Re: VCE Biology Question Thread
« Reply #10999 on: October 27, 2018, 04:33:14 pm »
+2
What exactly is the purpose of the primers in PCR?
So they attach to the complementary DNA strand, but why???
So you have a starting place for the polymerase to act on. The primers usually anneal just outside to the section of DNA that we want to amplify.

Robot10

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Re: VCE Biology Question Thread
« Reply #11000 on: October 27, 2018, 04:34:13 pm »
+3
What exactly is the purpose of the primers in PCR?
So they attach to the complementary DNA strand, but why???

Primers act as a binding site for Taq  polymerase, as otherwise Taq polymerase cannot attach and complete the 3rd step of PCR: extension

EllingtonFeint

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Re: VCE Biology Question Thread
« Reply #11001 on: October 27, 2018, 05:33:35 pm »
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Q1 what is molecule A? Is it a carbohydrate?? (1st image)

Anticodons are found in tRNA right? And are codons in mRNA?

Why is d correct? Is it because 1 fatty acid produces 8 Acetyl CoA? If so, what would be the ATP ratio produced (like fatty acid vs glucose - possibly how many Acetyl CoA would one glucose molecule produce?))


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C14M8S

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Re: VCE Biology Question Thread
« Reply #11002 on: October 27, 2018, 05:51:47 pm »
+1
Q1 what is molecule A? Is it a carbohydrate?? (1st image)

Anticodons are found in tRNA right? And are codons in mRNA?

Why is d correct? Is it because 1 fatty acid produces 8 Acetyl CoA? If so, what would be the ATP ratio produced (like fatty acid vs glucose - possibly how many Acetyl CoA would one glucose molecule produce?))
I couldn't view the images, however it is correct to state that codons are in mRNA and anticodons are in tRNA.
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Sine

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Re: VCE Biology Question Thread
« Reply #11003 on: October 27, 2018, 06:04:44 pm »
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Q1 what is molecule A? Is it a carbohydrate?? (1st image)

Anticodons are found in tRNA right? And are codons in mRNA?

Why is d correct? Is it because 1 fatty acid produces 8 Acetyl CoA? If so, what would be the ATP ratio produced (like fatty acid vs glucose - possibly how many Acetyl CoA would one glucose molecule produce?))



As above I also wasn't able to view any of the images.

C14M8S

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Re: VCE Biology Question Thread
« Reply #11004 on: October 27, 2018, 06:09:37 pm »
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How do receptors develop tolerance to hormones i.e in type 2 diabetes? I know that this can be caused by aging, but what other ways can this be onset?
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EllingtonFeint

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Re: VCE Biology Question Thread
« Reply #11005 on: October 27, 2018, 07:15:35 pm »
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As above I also wasn't able to view any of the images.

Ughhh, my images aren’t passing security checks... what do I do?
The other times when I upload images I literally have to compress the image with an app, save to photos, upload to ‘files’, then upload onto here... how do I skip the hassle no an iPad??

And now the pics are getting rejected  :'(
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EllingtonFeint

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Re: VCE Biology Question Thread
« Reply #11006 on: October 27, 2018, 07:47:30 pm »
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Do we need to know about light chains and heavy chains and parts of an antibody for the exam, cos I haven’t really learnt much about that at all  :(
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Owlbird83

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Re: VCE Biology Question Thread
« Reply #11007 on: October 27, 2018, 07:51:06 pm »
+1
Do we need to know about light chains and heavy chains and parts of an antibody for the exam, cos I haven’t really learnt much about that at all  :(
study design:
'the characteristics and roles of components of the adaptive (specific) immune response including the actions of B lymphocytes and their antibodies (including antibody structure) in humoral immunity, and the actions of T helper and T cytotoxic cells in cell-mediated immunity.'

Yes
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peachxmh

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Re: VCE Biology Question Thread
« Reply #11008 on: October 27, 2018, 08:07:31 pm »
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Hiya, in carbon-14 dating, is it the Carbon 14 to Nitrogen 14 ratio that is measured or the Carbon 12 to Carbon 14 ratio that is measured (/or both)? (a bit panicked bc I learnt that it was C-12:C-14 but a VCAA question said it was C-14:N-14 ahhhhh
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Owlbird83

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Re: VCE Biology Question Thread
« Reply #11009 on: October 27, 2018, 08:31:55 pm »
+4
Hiya, in carbon-14 dating, is it the Carbon 14 to Nitrogen 14 ratio that is measured or the Carbon 12 to Carbon 14 ratio that is measured (/or both)? (a bit panicked bc I learnt that it was C-12:C-14 but a VCAA question said it was C-14:N-14 ahhhhh

Carbon 14 to Nitrogen 14. (at least that is what I have been taught).

Edit: I just googled it and a website said C-12 to C-14 ratio is compared, and that C-14 radioactively decays into N-14. However, others have said C-14 to N-14 ratio, so I don't know :-\. It's best to stick with whatever VCAA says is correct.

edit#2: I read something that sort of makes sense. I think it could be both because it said
-in living organisms there is an equal number of C-14 and C-12 in the body
-The C-14 decays over time in dead organisms into N-14
so you are comparing the C-14 to N-14 ratio, with the knowledge that C-14 originally was the same amount as the amount of C-12?
...I think
« Last Edit: October 27, 2018, 08:54:22 pm by Owlbird83 »
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