2020 VCAA Biology Exam Solutions

[Bri MT]

Hey everyone, please keep in mind that reading this that we don't 100% know how these will marked, whether your phrasing would get full marks or not etc. Please try not to overanalyse and get stressed if what you remember writing doesn't perfectly line up with others' answers

[THO0088]

"However, a small portion of long-lived T cells still remains for rapid response upon pathogen re-exposure. This kind of cells is called memory T cells."- quoted from the internet.

So for this question, the answer would be that both b and t cells have an immunological memory.

Are T memory cells in our study design - considering they specifically mention cytotoxic T cells and T-helper cells for the cell mediated immunity?

[darkz]

Are T memory cells in our study design - considering they specifically mention cytotoxic T cells and T-helper cells for the cell mediated immunity?

Well considering that you learn about vaccinations in the course, it is very safe to assume that the generation of memory cells is relevant. i.e. you don't need to know specifics, but you need to acknowledge their existence.

[Isaac S]

For question 11 on MC, wouldn't the answer be A? Repeating an experiment multiple times is to improve and assess reliability. Repeating an averaging data doesn't improve accuracy because if you repeated an experiment in the incorrect way, you wouldn't get accurate results anyway? 

[ezdebebe]

For question 11 on MC, wouldn't the answer be A? Repeating an experiment multiple times is to improve and assess reliability. Repeating an averaging data doesn't improve accuracy because if you repeated an experiment in the incorrect way, you wouldn't get accurate results anyway?

That's exactly what I did!

[dedformed]

Why is Q34 C? Isnt that the option to "destroy all cattle"? I thought that would be quite unethical and I picked A...

Edit: ah wait i realised that they cant pass on prions theough reproduction! Ahhhh dang it! C still seemed wrong tho cuz ethics

[darkz]

For question 11 on MC, wouldn't the answer be A? Repeating an experiment multiple times is to improve and assess reliability. Repeating an averaging data doesn't improve accuracy because if you repeated an experiment in the incorrect way, you wouldn't get accurate results anyway?

Yeh I definitely do agree with you that accuracy isn't the best answer, and thinking about it more, I'd say its more leaning towards precision. Though personally, I can't remember the difference between reliability and precision so yeh...as indicated, not 100% sure about this one.

Why is Q34 C? Isnt that the option to "destroy all cattle"? I thought that would be quite unethical and I picked A...

Edit: ah wait i realised that they cant pass on prions theough reproduction! Ahhhh dang it! C still seemed wrong tho cuz ethics

Well, what actually happened is that they had to incinerate the cattle and then there was a massive ban on meat products so that's why I picked it.

[2020VCE]

Hey Guys,
Just wanted to ask what type of study score you think i will get for bio if i was ranked about 6th-9th in the cohort and my average grades are:

GA1- 82%
GA2- 87%
GA3- 72-74% approx.

Thanks.

[Laura.Barclayy]

Hey, does anyone remember what q 4 for multi choice was vs Q5? I remember one was an enzyme q lol