VCE Biology Question Thread

[makram]

What happens to plasma cells after the infection is eliminated?

[angrybiscuit]

What happens to plasma cells after the infection is eliminated?

I would assume they would die off eventually as if they were alive indefinitely then there will be no use for memory B cells.

[J_Rho]

How does this definition sound guys?

Diffusion is the passive movement of molecules from areas of high concentration to areas of low concentration (down the concentration gradient) across a semi-permeable membrane, whereas Osmosis is the movement of molecules across a semipermeable membrane in order to reach a point of equilibrium. The steeper the concentration gradient the faster the rate of osmosis.

[whys]

Diffusion is the passive movement of molecules from areas of high concentration to areas of low concentration (down the concentration gradient) across a semi-permeable membrane, whereas Osmosis is the movement of molecules across a semipermeable membrane in order to reach a point of equilibrium. The steeper the concentration gradient the faster the rate of osmosis.

You must say net movement in both definitions. Not all molecules follow this movement - it is random and passive so we are only measuring the net movement of molecules, not ALL molecules. Osmosis is defined as the random and passive net movement of free water molecules from a region of low solute concentration to a region of high solute concentration through a semipermeable membrane. Diffusion does not necessarily have to occur through a membrane, so that part is unnecessary. With diffusion, you need to compare the solute concentrations, so I think it would be better to use the words higher and lower instead of high and low.

[J_Rho]

You must say net movement in both definitions. Not all molecules follow this movement - it is random and passive so we are only measuring the net movement of molecules, not ALL molecules. Osmosis is defined as the random and passive net movement of free water molecules from a region of low solute concentration to a region of high solute concentration through a semipermeable membrane. Diffusion does not necessarily have to occur through a membrane, so that part is unnecessary. With diffusion, you need to compare the solute concentrations, so I think it would be better to use the words higher and lower instead of high and low.

Thank you!! That was a really good explanation i don't know how i missed the word net!

[Bsaini]

So I'm new on the VCE scene doing bio 1/2 in year 10, and I'm stressing out about units 1 and 2 even though it's not a big thing but how important is it? Does knowledge from 1/2 get covered in 3/4? And any study tips would be greatly appreciated.

[darkz]

So I'm new on the VCE scene doing bio 1/2 in year 10, and I'm stressing out about units 1 and 2 even though it's not a big thing but how important is it? Does knowledge from 1/2 get covered in 3/4? And any study tips would be greatly appreciated.

Traditionally, only a small portion of 1&2 is used in 3&4 and the rest is largely unused. And even with the introduction of the new 2021 study design, I reckon that this will remain the same, with only key biological concepts which serve as the foundation for 3&4 topics being examined.

[linesido]

So I'm new on the VCE scene doing bio 1/2 in year 10, and I'm stressing out about units 1 and 2 even though it's not a big thing but how important is it? Does knowledge from 1/2 get covered in 3/4? And any study tips would be greatly appreciated.

Darkz is right. However I do remember that my bio teacher said a lot of the current design will be removed. I'm not sure how valid this is but maybe keep it in mind.

A tip that is basically applicable for all science: Doing questions > content notes.

[Bsaini]

Traditionally, only a small portion of 1&2 is used in 3&4 and the rest is largely unused. And even with the introduction of the new 2021 study design, I reckon that this will remain the same, with only key biological concepts which serve as the foundation for 3&4 topics being examined.

oh okay great, meaning I shouldn't really be stressing about units 1/2? Also, how can i "test" my knowledge especially since everyone is learning from home?

[darkz]

oh okay great, meaning I shouldn't really be stressing about units 1/2? Also, how can i "test" my knowledge especially since everyone is learning from home?

In terms of consolidating knowledge for 1&2, I'd recommend asking your teacher for resources. There aren't many commercial exams/ questions available for 1&2 because people just don't make them as your marks don't count towards anything. However, if you're really motivated, you can comb through past VCAA exams for questions - some topics e.g. pedigrees etc were on old study designs and are now in 1&2.

[WhatisaMeMe]

Hi guys:
I have a question about experimental design. Lets say if we are designing an experiment and investigating the effect of temperature on enzymes (present in body), can my control group have normal body temperature, as enzyme activity will be optimum and thus fastest rate. And by having experimental groups with lower or higher temperature, we can observe the effect of altering the temp?

Thanks so much in advanced!!!

[Bsaini]

Does anyone know when the updated study design for bio 3/4 (2021)will come out? If so could you send a link?
THANK YOU

[SmartWorker]

Hi guys:
I have a question about experimental design. Lets say if we are designing an experiment and investigating the effect of temperature on enzymes (present in body), can my control group have normal body temperature, as enzyme activity will be optimum and thus fastest rate. And by having experimental groups with lower or higher temperature, we can observe the effect of altering the temp?

Thanks so much in advanced!!!

Yeah that would work. So your control group is approximately 37ºC and the experimental groups can be: 0ºC, 20ºC, 50ºC, 70ºC. But It might be tricky to maintain the temperature, if you are physically doing the experiment.

Does anyone know when the updated study design for bio 3/4 (2021)will come out? If so could you send a link?
THANK YOU

Hey, they released this a few weeks ago:
https://www.vcaa.vic.edu.au/curriculum/vce/vce-study-designs/biology/Pages/Index.aspx

Scroll down to: "Study design for implementation in 2021"

[Bsaini]

Yeah that would work. So your control group is approximately 37ºC and the experimental groups can be: 0ºC, 20ºC, 50ºC, 70ºC. But It might be tricky to maintain the temperature, if you are physically doing the experiment.


Hey, they released this a few weeks ago:
https://www.vcaa.vic.edu.au/curriculum/vce/vce-study-designs/biology/Pages/Index.aspx

Scroll down to: "Study design for implementation in 2021"

Thank you so much

[ABB0005]

Are you allowed to use pencil for the vcaa biology MC section and pen for SA questions, also when remembering signalling molecules do we also need to know the specific details e.g. action potentials in neurotransmitters