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July 16, 2019, 10:43:08 am

Author Topic: VCE Biology Question Thread  (Read 1259264 times)  Share 

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peachxmh

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Re: VCE Biology Question Thread
« Reply #10995 on: October 27, 2018, 01:30:06 pm »
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For q4(d) in Section B of the 2011 VCAA Exam 1, can someone explain why it is necessary to include that the baby is receiving antibodies from the mother? My answer was simply that probiotics would be passed from the mother to baby via the umbilical cord, and the baby is receiving probiotics, so its TLRs are being exposed to a wide variety of antigens and thus being stimulated, resulting in the babies in Group 1 being less likely to develop asthma or eczema. What are the antibodies being produced against, and how does this protect against autoimmunity? The probiotics are beneficial bacteria, so I'm unsure how the maternal antibodies would protect the baby..
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vox nihili

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Re: VCE Biology Question Thread
« Reply #10996 on: October 27, 2018, 01:48:44 pm »
+2
2015 Q 5c
A possible answer given is B cell produces antibodies
And rough er produces proteins that make up these antibodies.

So are there rough er INSIDE of a B cell?

There's rough ER in every cell basically. Plasma B-cells have a particularly large one.

For q4(d) in Section B of the 2011 VCAA Exam 1, can someone explain why it is necessary to include that the baby is receiving antibodies from the mother? My answer was simply that probiotics would be passed from the mother to baby via the umbilical cord, and the baby is receiving probiotics, so its TLRs are being exposed to a wide variety of antigens and thus being stimulated, resulting in the babies in Group 1 being less likely to develop asthma or eczema. What are the antibodies being produced against, and how does this protect against autoimmunity? The probiotics are beneficial bacteria, so I'm unsure how the maternal antibodies would protect the baby..

I initially typed out a response to this that focused on the fact that probiotics is a bad word that shouldn't be used because it's more of a marketing term than a scientific one. I then went on to say that bacteria aren't present in fetal or indeed maternal circulation and therefore it was a silly idea that probiotics are passed down the umbilical cord. But VCAA told you both of these things. Ignore this question. The information VCAA have given you is absurd.
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missile

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Re: VCE Biology Question Thread
« Reply #10997 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 #10998 on: October 27, 2018, 02:55:02 pm »
0
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 #10999 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 #11000 on: October 27, 2018, 04:30:55 pm »
0
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 #11001 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 #11002 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 #11003 on: October 27, 2018, 05:33:35 pm »
0
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 #11004 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 #11005 on: October 27, 2018, 06:04:44 pm »
0
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 #11006 on: October 27, 2018, 06:09:37 pm »
0
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 #11007 on: October 27, 2018, 07:15:35 pm »
0
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 #11008 on: October 27, 2018, 07:47:30 pm »
0
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 #11009 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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