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March 29, 2024, 09:40:17 pm

Author Topic: VCE Biology Question Thread  (Read 3571609 times)  Share 

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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13245 on: November 13, 2020, 06:52:56 pm »
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For this question
Peer review is essential to the scientific process because
A several experts in the field are able to scrutinise a finding before it can be published
B the process immediately validated any hypotheses tested in the experiments
C  the process can lead to improvements in articles prior to being published
D it is the primary means for informing the general public about new information in the field
E it tests hypotheses proposed by other investigators

Would this be a and why can’t it be c

caffinatedloz

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Re: VCE Biology Question Thread
« Reply #13246 on: November 13, 2020, 09:45:15 pm »
+7
For this question
Peer review is essential to the scientific process because
A several experts in the field are able to scrutinise a finding before it can be published
B the process immediately validated any hypotheses tested in the experiments
C  the process can lead to improvements in articles prior to being published
D it is the primary means for informing the general public about new information in the field
E it tests hypotheses proposed by other investigators

Would this be a and why can’t it be c

That's a tricky one! When I look at that question, although I think that answer C is right (peer review can lead to article improvement) I don't think that this is the key reason it is essential to the scientific process. Peer review is important for maintaining the integrity of science and helps to stop crackpots from publishing anything and being seen as reputable by others. I think that A is more correct as it better addresses the question. Does that make sense?

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13247 on: November 13, 2020, 09:59:37 pm »
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Yes that makes sense. Thanks!

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13248 on: November 13, 2020, 11:11:56 pm »
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For this would this be fine for relating characteristics of structure to function

caffinatedloz

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Re: VCE Biology Question Thread
« Reply #13249 on: November 14, 2020, 06:23:12 am »
+5
For this would this be fine for relating characteristics of structure to function

Hey Chocolatepistachio,
Your answers and good, but a way of elevating them would be to emphasise the way that the structure enables the function.

I know that the space to write is really tiny, so this may not all fit, but for the chloroplasts, you could write something along the lines of: The chlorophyll pigment in the thylakoids allows light energy to be absorbed, powering the light-dependent reactions within the disks.

In my answer I've focused on the two features given in the question and how working together they assist chloroplasts to perform their function (photosynthesising and producing glucose).

In the answer you've given for ribosomes, a way of shifting the focus would be to discuss the second structural point they gave about the location of ribosomes. You could highlight how free ribosomes can produce and release proteins directly where they are needed in the cytosol of the cell and ribosomes studding the ER can release them to be modified and transported before eventually being packaged into vesicles and released through exocytosis.

Hope that this helps!
« Last Edit: November 14, 2020, 06:37:20 am by laura_ »

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13250 on: November 20, 2020, 11:39:38 am »
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If someone could help with this question this is what I have written so far
A protein destined for release to the outside of the cell has just been synthesised on a ribosome present on the rough endoplasmic reticulum. Describe the modifications it undergoes in rough endoplasmic reticulum and Golgi apparatus and how it is transported to outside of the cells (5 marks)

The rough endoplasmic reticulum folds the proteins into the correct shape. The protein buds off the rough endoplasmic reticulum in a vesicle and is then transported to the Golgi body. This vesicle then moves to the Golgi apparatus to undergo chemical modifications and packaging. They are then packaged in vesicles for export from the cell by exocytosis.

waterangel82

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Re: VCE Biology Question Thread
« Reply #13251 on: November 29, 2020, 05:43:55 pm »
+4
If someone could help with this question this is what I have written so far
A protein destined for release to the outside of the cell has just been synthesised on a ribosome present on the rough endoplasmic reticulum. Describe the modifications it undergoes in rough endoplasmic reticulum and Golgi apparatus and how it is transported to outside of the cells (5 marks)

The rough endoplasmic reticulum folds the proteins into the correct shape. The protein buds off the rough endoplasmic reticulum in a vesicle and is then transported to the Golgi body. This vesicle then moves to the Golgi apparatus to undergo chemical modifications and packaging. They are then packaged in vesicles for export from the cell by exocytosis.

This is a good response, but maybe you could add a little more detail to some parts. For instance, the for 'chemical modifications' you could maybe say the addition of sugar groups (although this may be extra detail, as it's been a while since I've done VCE biology) and you could maybe also expand on exocytosis a little bit (such as the fact that the vesicle fuses with the plasma membrane and contents are released outside the cell).
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Oynx

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Re: VCE Biology Question Thread
« Reply #13252 on: December 01, 2020, 10:31:39 pm »
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Are condensation reactions and condensation polymerisation the same thing? I've had a few resources refer to both but I'm not sure if they are the same thing or not.

Thanks
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Evolio

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Re: VCE Biology Question Thread
« Reply #13253 on: December 02, 2020, 11:43:34 am »
+5
Are condensation reactions and condensation polymerisation the same thing? I've had a few resources refer to both but I'm not sure if they are the same thing or not.

Thanks
Hey Oynx!
No, they are not the same thing and thus they are not interchangeable.

They are both similar in that H20 (water) is released. However, with condensation polymerisation, repeating sub units (monomers) are bonded together to form polymers. This is seen when amino acids (the monomers) form peptide bonds with each other to form a polypeptide (the polymer).
Condensation is simply water being released.

Hope this helps!

Oynx

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Re: VCE Biology Question Thread
« Reply #13254 on: December 02, 2020, 02:41:47 pm »
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Hey Oynx!
No, they are not the same thing and thus they are not interchangeable.




They are both similar in that H20 (water) is released. However, with condensation polymerisation, repeating sub units (monomers) are bonded together to form polymers. This is seen when amino acids (the monomers) form peptide bonds with each other to form a polypeptide (the polymer).
Condensation is simply water being released.

Hope this helps!

Thanks for the reply much appreciated, so I would use condensation polymerisation when monomers form polymers?

So I would be marked wrong if I say "polypeptide chains are formed through condensation reactions"?

« Last Edit: December 10, 2020, 08:58:55 pm by Oynx »
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Evolio

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Re: VCE Biology Question Thread
« Reply #13255 on: December 02, 2020, 03:15:31 pm »
+5
Thanks for the reply much appreciated, so I would use condensation polymerisation when monomers form polymers?
Yes, I think so.

Quote
So I would I be marked wrong if I say "amino acid polymers are formed through condensation reactions"?
It's not wrong necessarily but it's better to say 'condensation polymerisation' as there is that extra detail of monomers (amino acids) forming polymers. So, it would be better to say 'condensation polymerisation' in responses when talking about this process.Also, be careful: it's amino acid monomers not amino acid polymers. The polypeptide is the polymer.

Oynx

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Re: VCE Biology Question Thread
« Reply #13256 on: December 02, 2020, 04:27:49 pm »
+1
Yes, I think so.
It's not wrong necessarily but it's better to say 'condensation polymerisation' as there is that extra detail of monomers (amino acids) forming polymers. So, it would be better to say 'condensation polymerisation' in responses when talking about this process.Also, be careful: it's amino acid monomers not amino acid polymers. The polypeptide is the polymer.

Ah yes, fixed it the monomer, polymer stuff up. Thanks for the help!
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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13257 on: December 10, 2020, 08:22:09 pm »
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If someone could help with this question I don’t understand would it be c

Why do solutions for intravenous injections into people with low blood volume (perhaps due to dehydration) normally contain 0.9% NaCl ?
A this is a hypotonic solution which will cause water to move into dehydrated blood cells
B this is an isotonic solution, and the water in IV fluid will follow Na+ and Cl- into the intracellular fluid compartment
C this is an isotonic solution, and Na+ and Cl- are non penetrating solutes. Na+ and Cl- will keep the water in iv fluid in the extracellular fluid compartment
D Na+ and Cl- are penetrating solutes which will get these more quickly into blood cells to increase their volume

darkz

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Re: VCE Biology Question Thread
« Reply #13258 on: December 10, 2020, 11:06:47 pm »
+6
If someone could help with this question I don’t understand would it be c

Why do solutions for intravenous injections into people with low blood volume (perhaps due to dehydration) normally contain 0.9% NaCl ?
A this is a hypotonic solution which will cause water to move into dehydrated blood cells
B this is an isotonic solution, and the water in IV fluid will follow Na+ and Cl- into the intracellular fluid compartment
C this is an isotonic solution, and Na+ and Cl- are non penetrating solutes. Na+ and Cl- will keep the water in iv fluid in the extracellular fluid compartment
D Na+ and Cl- are penetrating solutes which will get these more quickly into blood cells to increase their volume


For this question, what we're looking for is something that will increase the extracellular fluid level. That is, the question tells us that we give people 0.9% NaCl for those with low blood volume, thereby increasing their blood volume (extracellular fluid level). Knowing this, we can eliminate the other answer options as follows:

A. If it were hypotonic and water moved into the RBCs, they'd likely lyse. Also, we want to increase blood volume, not move water into RBCs.
B. Isotonic refers to the same solute concentration on either side and therefore there should be no net movement of water. Also, there should be no significant flux of \(Na^+\) or \(Cl^-\) into a cell, since they're both charged ions and hence cannot freely diffuse.
C. Yes, isotonic means no net movement of water, allowing the NaCl solution to remain the extracellular fluid.
D. Again, we don't want to increase the fluid within RBCs, and don't think they're penetrating solutes either
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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13259 on: December 11, 2020, 04:27:08 pm »
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Thanks

For this question how many marks would i get if i wrote this
1. calcium ions cannot pass through the phospholipid bilayer as they are polar charged ions only hydrophobic non polar substances can easily diffuse through the bilayer as most of the bilayer is non polar.

2. calcium pumps transport calcium ions across the membrane using energy obtained from the hydrolysis of ATP