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VCAA Sample Exam (2017) Solutions
vox nihili:
--- Quote from: chrissle on September 11, 2017, 11:47:10 am ---Thanks! ;D So to summarise the process is:
1. gene probes in sample to identify a specific sequence of DNA
2. amplify that DNA using PCR
3. Run DNA through gel electrophoresis
--- End quote ---
Effectively yes. Just remember that all PCR involves probes though, so you'd just say that the probes used in the PCR are specific to a sequence of interest :)
Quantum.:
Just thought I'd mention that with 1b, there are only four groups being tested that instead indicate a decrease overall, and that with 7c, I think radiometric dating (uranium-lead) would be used for dating the rock preserving the fossil rather than the fossil itself? Otherwise, thank you so much for the solutions - they have been super helpful!
vox nihili:
--- Quote from: Quantum. on September 29, 2017, 03:28:27 pm ---Just thought I'd mention that with 1b, there are only four groups being tested that instead indicate a decrease overall, and that with 7c, I think radiometric dating (uranium-lead) would be used for dating the rock preserving the fossil rather than the fossil itself? Otherwise, thank you so much for the solutions - they have been super helpful!
--- End quote ---
1b. Absolutely, will amend when I get home.
7c. Yes, kind of... you’re quite right that typically this kind radiometric dating is used to date the rock containing the fossil, rather than the fossil itself, but it can be used to date the fossil, too. Two examples of this: an imprint in rock (from a foot print for example) is itself a fossil. Likewise, the process of petrifaction sees organic matter replaced with minerals, which likewise can be dated by lead-uranium.
For those reading: carbon still does the fossil itself.
Anyway, it’s an interesting point you raise. One I hadn’t considered!
Thanks for looking over the answers, I’m glad there were only a couple of minor things
Quantum.:
Thanks for the explanation - that makes a lot of sense! Can't wait for this year's actual exam 😅
gemmaruffin:
Hey, just wondering if you could explain MC Q 15?
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