Biology Exam: Answers and Discussion!

[tzacchary]

38/40 on multiple choice, not too bad! 

I misunderstood/misread the first S.A question, lost 3 out of 4 easy marks :/ and for some reason (I don't know how, looking back at the exam) managed to completely screw up the # of nucleotides (the one where the answer was 273 or something). Apart from that, I think I did decent, far much more unit 4 stuff than I was anticipating.

Slightly harder than last years I reckon, just the different content made it seem worse than it is.

[vcestudent123]

I wrote:

90 amino acids, and 3 nucleotides per amino acid hence 90*3=270
However, add 3 nucleotides for STOP codon
Therefore 270+3=273 bases needed

Damn.. I thought they were trying to trick us with that question... I guess it was more straightforward then I thought.

[dankfrank420]

What did you all say for the making more copies of Otzi's DNA question?

It was basically asking you to describe the PCR

[Idolift]

Did everyone say Otzi was involved in a mass cult suicide?

jks aside, you said bar fight and he was left in the snow yeah?

[doomdestroyer]

Did everyone say Otzi was involved in a mass cult suicide?

jks aside, you said bar fight and he was left in the snow yeah?

I said blood from the animals that Otzi hunted got onto his shirt and that another possibility was blood from another person. I could have explained this a lot more, but i was running out of time.

[Vicbelgaus]

Did everyone say Otzi was involved in a mass cult suicide?

jks aside, you said bar fight and he was left in the snow yeah?

I said ''it was hypothesised that he was in a fight with three other individuals''

[SarahLoria]

What did you guys say for the pancreas/liver SA in regards to the hormone stimulating the process within the cell?

[selinasch]

I said ''it was hypothesised that he was in a fight with three other individuals''

Yeah I said exactly the same, figured 3 other blood samples that aren't his, therefore 3 other people 

[doomdestroyer]

What did you guys say for the pancreas/liver SA in regards to the hormone stimulating the process within the cell?

I just described the usual pathway in signal transduction for a hydrophilic hormone. How it binds to the specific receptor on the outside surface of the cell membrane as it is unable to pass across the cell membrane. How that activates a G protein which in turn activates enzymes that produce second messengers. That a cascade of events occurs resulting in a coordinated response. I referred specifically to the hormone and response as well.

[someone011]

I did

- two large groups of polypeptides, one with lys in third sport and one with not-lys in third spot
- insert groups in cells
- stating which results would support hypothesis

I said you'd need 20 different polypeptide sequences; all sequences must be the same, except for the 3rd amino acid (which will be lots of different amino acids, including lys) - is this completely wrong?

[TimewaveZero]

For the drawing of the monomers question, did you guys draw a line of connected amino acids for the protein? Or the structure with the R group, carboxyl group, amino group and hydrogen? My teacher said this was ambiguous and even he didn't know which one they where talking about. I did the latter.

also, dropped 5 marks on MC

[dankfrank420]

Maybe VCAA will be nice and award everyone full marks for that question 

[doomdestroyer]

Maybe VCAA will be nice and award everyone full marks for that question 

Ha...Ha....Ha...

[Reus]

Well the satisfaction of burning practice exam s
And damn 100+ viewing this topic... 

[vella97]

Hey guys are these answers 100% verified because for question 12 it seems like the answer would be B rather than D? If I'm wrong could someone explain why it would be D? Thanks