VCE Biology Question Thread

[quintonishere]

They are transmembrane proteins like the other two. Here ligand binding (or voltage changes) will cause a conformational change that opens the channel, allowing the ion/molecule to pass through.

What is that type of protein called?

[dedformed]

What is that type of protein called?

If they're affected (opened/ closed) by electrical impulses then they're called voltage gated ion channels. If they're affected by binding to ions they're called ligand gated ion channels.
We briefly touched on them later in AOS 1 when we did chemical messengers (specifically when covering neurotransmission).

[ErnieTheBirdi]

Hey everyone,
I did 3/4 biology this year and I'm in Year 11. The results come out tomorrow, I was just wondering does anyone know whether the scores we get tomorrow via email from vass is a scaled or raw score?

[Snow Leopard]

Hey everyone,
I did 3/4 biology this year and I'm in Year 11. The results come out tomorrow, I was just wondering does anyone know whether the scores we get tomorrow via email from vass is a scaled or raw score?

I didn't do Bio this year, but I'm pretty sure we get the raw score but the score contributing to your ATAR next yr would have your Bio SS which scaled in 2020. So if you want to find out your scaled score for Bio just ask someone who got the same raw score as you and how it scaled for them. 

[waterangel82]

I didn't do Bio this year, but I'm pretty sure we get the raw score but the score contributing to your ATAR next yr would have your Bio SS which scaled in 2020. So if you want to find out your scaled score for Bio just ask someone who got the same raw score as you and how it scaled for them. 

I agree with @Snow Leopard, you would only get your raw Bio study score this year.

[Chocolatepistachio]

For this question would it be b or would it be inside the cells
Where is most of our total body water located?
A in blood
B in the interstitial fluid
C inside cells
D in the extracellular fluid

[vox nihili]

For this question would it be b or would it be inside the cells
Where is most of our total body water located?
A in blood
B in the interstitial fluid
C inside cells
D in the extracellular fluid

Inside the cells (intracellular fluid)

[Chocolatepistachio]

A patient urgently needs isotonic solution if I/v fluid- you have the choice of 0.9% NaCl and 5% dextrose in 0.45% NaCl- what fluid is better suited as an isotonic solution. What side effects would you expect if you has chosen the other fluid. Is the other fluid hypotonic or hypertonic?

For this question I don’t understand why 0.9% NaCl would be better suited and would this be right for the second part

The other solution 5% dextrose in 0.45% NaCl is hypertonic it would cause solutes to move from inside the cell to outside causing the patient to become  dehydrated.

[miahkhan90]

What's better to use for help next year? Like is atarnotes, neap notes or cambridge best to use for help next year?

[1729]

A patient urgently needs isotonic solution if I/v fluid- you have the choice of 0.9% NaCl and 5% dextrose in 0.45% NaCl- what fluid is better suited as an isotonic solution. What side effects would you expect if you has chosen the other fluid. Is the other fluid hypotonic or hypertonic?

For this question I don’t understand why 0.9% NaCl would be better suited and would this be right for the second part

The other solution 5% dextrose in 0.45% NaCl is hypertonic it would cause solutes to move from inside the cell to outside causing the patient to become  dehydrated.

For the first question, red blood cells (RBCs) have an NaCl concentration of 0.9%, and they have a glucose concentration of 5%. Even though the dextrose concentration in the second I/V fluid option equals the RBC’s concentration, the second I/V fluid option has a much lower amount, this would cause too much water to flow into the RBCs, resulting in hemolysis (the RBCs burst). The first I/V fluid, though, has the same NaCl concentration, so it would be isotonic.

In regards to your answer for the other question, it's what I mentioned about hemolysis. The lower concentration of NaCl in the second fluid makes it hypotonic with regards to the NaCl.

[rozmaaate]

Apparently glusose diffuses across the plasma membrane via a carrier protein . However some past vcaa exams say through a protein channel just wondering what is correct or whether it's possible to be penailised for saying one or the other

[miyukiaura]

What's better to use for help next year? Like is atarnotes, neap notes or cambridge best to use for help next year?

I used the atarnotes course notes & topic tests and biozone imo it's not necessary to have cambridge checkpoints or neap

Apparently glusose diffuses across the plasma membrane via a carrier protein . However some past vcaa exams say through a protein channel just wondering what is correct or whether it's possible to be penailised for saying one or the other

Glucose diffuses through specific glucose transport carrier proteins. While you wouldn't be penalised for saying channel/carrier I would write carrier protein just to be safe

Mod Edit: Merged Posts

[Chocolatepistachio]

could someone please explain this why is it divided by 1000 its going from millimoles to micromoles so shouldn't it be x 1000  and how do you convert from micrograms to grams

[bluebird]

Hi! I hope I'm posting this in the right place but do we need to know cell theory and features of eukaryotic or prokaryotic cells bc its in the Heinemann Textbook yet not really mentioned on the study design (i think)?
Thanks
-bluebird 

[Erutepa]

Hi! I hope I'm posting this in the right place but do we need to know cell theory and features of eukaryotic or prokaryotic cells bc its in the Heinemann Textbook yet not really mentioned on the study design (i think)?
Thanks
-bluebird 

you do need to know both of these things - they fall under this point in the study design:
"cells as the basic structural feature of life on Earth, including the distinction between prokaryotic and eukaryotic cells"

the point "cells as the basic structural feature of life on Earth" here essentially refers to cell theory. Your textbook might go into a fair bit of depth on cell theory and so you probably won't need to know everything the textbook covers - but I imagine most of what it covers will be important to understand.

Also, you have indeed posted you question in the right place