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jo-david

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    Male
  • Exams
    May 2014
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    Canada

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    DavidthebestCho
  1. I think it depends on the renewal of each curriculum. For example, math HL has a new curriculum starting this year, so they had a brand new data booklet, on which it says "first examination 2014." However, for chemistry, I was provided with a data booklet saying "first examination 2009," which is when I think they renewed the curriculum. So I don't know about physics, but that's how it goes I think.
  2. How did everyone's papers go? Paper one was at the expected level of difficulty, or a bit easier than past papers. I noticed some twists they tried to put in, in order to increase the distinguishing factor (is that even how its called idk) On the other hand, paper two was TERRIBLE. I gotta admit, I didn't prepare well for Chemistry in general, and i only skimmed through one past paper 2 just to look at its structure, so yes I wasn't prepared. But oh. my.god. I'd be lucky if I got 50% out of it. Was it just me not studying enough, or was this paper hard in general?
  3. I was shocked to see the Rolle's theorem question, but managed to do it anyway haha but I couldn't finish the very last part, where i had to prove the equation had 2 zeros. Also, for the interval of the convergence, I proved that the lower radius was convergent, but didn't know how to test the convergence for the upper radius. So I hope I still get like a third of the whole marks in that part. Overall, I'm expecting about 50/60. Time managing wasn't as hard as I experienced in p1 and p2
  4. Paper 1 barely had any probability/stat question, so I knew there was going to be a lot in paper 2. I tried to manage time well after not answering almost 25 marks in paper 1, but I still didn't have enough time, and I didn't answer to almost 30 marks I think. I could've made more use of calculator to save some time, but oh well it's over now
  5. I don't exactly remember answers to each question :/
  6. Different Timezone gets different subject report, so I'm assuming they have different grade boundaries. And what's TZ0? I thought it was either TZ1 (North America) or TZ2(Africa, Asia) (idk where Europe/Australia belongs) But then my HL paper 1 and 2 were in TZ1 and paper 3 was in TZ0. So bizzare
  7. Exactly my reaction too! It was so weird cause there was almost no stat question, and bam in paper 2
  8. I also did options E and H. I guess all the canadian students went with E and H, eh For the bird song question, I included things you guys talked about along with attracting the other gender partners and natural selection. Gotta say I was lost with a part of the rat question where I had to suggest reasons for the change in heart rate and blood pressure in cold water, but meh
  9. How did you guys think about the paper? I found the difficulty of the questions fairly doable except maybe a couple of them. But I had a trouble with managing time properly, so I ended up not answering to almost 25 marks. I'm confident about other 95 marks that I answered, though. :/
  10. Q: Stem Cells My Answer: I said that they can be transferred between organisms. I honestly didn't really know whether to pick that or the fact that they reproduce, all I remembered was that they have the ability to divide endlessly I was caught up on the word reproduce, since they don't really reproduce they replicate themselves by dividing. No clue. Q:Q: After one phase of meiosis of a diploid animal cell, what are the products? (doubting whether this was even a question.. cant remember) A: I can't remember what the exact answer I put was, but it was the one with chromosome number: n instead of 2n and the cells produced being 2. I don't think the answer talked about haploid/diploid! Q: "Overall" products of glycolysis A: 2 pyruvate, 2 ATP, 2 NADH is what I put as well to compensate for the 2 ATP lost through phosphorylation. Q: Stem Cell A: There are unlimited stem cells in adult tissues, and I think it is the answer as I checked it in my textbook Q: Meiosis A: 2 cells with n chromosomes, so 2 haploid cells I guess Q: Overall product A: 2 ATP, 2 NADH, 2 pyruvate I was leaning towards that but then I remembered reading this from Bio Ninja, which gave me the impression that adult tissues had a limited/minimal supply (I have no idea if this is correct ). This question should have been simple but the answers were somewhat confusing 2.1.10 Outline one therapeutic use of stem cells Stem cells can be derived from embryos or the placenta / umbilical cord of the mother; also minimal amounts can be harvested from some adult tissue Stem cells can be used to replace damaged or diseased cells with healthy, functioning ones The oxford ib dp biology course companion second edition: "Small numbers of cells seem to remain as stem cells, however an they are still present in the adult body. They are present in many human tissues, including bone marrow, skin and liver. They give some human tissues considerable powers of regeneration and repair. The stem cells in other tissues - for example, brain, kidney adn heart - only allow limited repair" I guess the choice of "unlimited" amount is not the best wording, but that option was the best compared to other three: They reproduce - they do replicate and differentiate, but they don't "reproduce" Transfer between species - idek if it's true or not, but that doesn't contribute to the repair and regeneration of damaged tissues They are specialized- they are not, yet. They have potential to be differentiated and specialized. In fact, if they are already specialized, it would not be able to repair damaged tissues
  11. I know for sure I got that one wrong ! I didn't really understand what it was asking and didn't really understand the picture that was given so I guessed all three... I think some people in my class said just replication, although I heard replication and transcription from a few people as well. I was debating between replication and replication and transcription too.. In the end I put just replication for the sole reason that the end of the url under the picture was ".com/replication_bubbles" haha probably not the best thing to base my answer on but seemed logical in the moment. I put replication and transcription. I went with replication only because of that url address and because I knew that was during replication by the micrograph. However, the wording of the question was like 'what could take place in any of the pointing area,' which made me think maybe they are suggesting transcription COULD happen there, which makes sense cause it unwinds the strands as well
  12. In paper 1, what did you guys think about these questions Q1: action potential in nerve cells A: I put axon only; even though I put A (anywhere in the cell) first and then changed the answer in the last minute :/ Q2: carbohydrates from cotyledon to embryos A: I put starch but very uncertain (the textbook says glucose or sucrose, and I think they both were choices?) Q3: the type of structure of this one chain in this protein A: Secondary structure (I was very unsure about it, I thought it was primary because it was polypeptide chain, but then it said folded polypeptide, which is why I went with the secondary sturcutre. But then, the question asked what describes the best of this "three dimensional" structure, so it could be tertiary, but there was a highlight on the "one" chain, so I went with secondary but not sure again) Q4: Precautionary principle A: taking precaution while constructing the project (I was debating between this and the supporters proving it is not harmful) Paper 2 Q5: The ratio of the phenotype of the test cross for this heterozygous gamete A: 1:1:1:1
  13. Q: Stem Cells My Answer: I said that they can be transferred between organisms. I honestly didn't really know whether to pick that or the fact that they reproduce, all I remembered was that they have the ability to divide endlessly I was caught up on the word reproduce, since they don't really reproduce they replicate themselves by dividing. No clue. Q:Q: After one phase of meiosis of a diploid animal cell, what are the products? (doubting whether this was even a question.. cant remember) A: I can't remember what the exact answer I put was, but it was the one with chromosome number: n instead of 2n and the cells produced being 2. I don't think the answer talked about haploid/diploid! Q: "Overall" products of glycolysis A: 2 pyruvate, 2 ATP, 2 NADH is what I put as well to compensate for the 2 ATP lost through phosphorylation. Q: Stem Cell A: There are unlimited stem cells in adult tissues, and I think it is the answer as I checked it in my textbook Q: Meiosis A: 2 cells with n chromosomes, so 2 haploid cells I guess Q: Overall product A: 2 ATP, 2 NADH, 2 pyruvate
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