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CaptainCook

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    May 2013
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    Poland

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  1. When metabolism is increased, there's higher concentration of CO2 and lactic acid in the blood, and consequently the pH of the blood decreases. Hemoglobin acts as buffer and absorbs H+ ions, which decreases hemoglobin's affinity for oxygen and the Bohr shift promotes the release of oxygen to the respiring tissue. Thus, the curve shifts to the right. I also drew the graph but I don't think it will be enough to get 6 points.
  2. So how did it go ? And what options did you choose? I wasn't particularly happy when I saw Bohr shift in option H but beyond that I think it was relatively easy.
  3. I think there were 3 cells, but I'm not certain.
  4. 17 downloads

    Option F for SL and HL - Microbes and biotechnology
  5. I also chose that one, other answers didn't seem valid.
  6. i said it was the RER itself, now you're making me doubt my answer It's most definitely rER because the source of the picture was /RoughER.gif It was golgi. The organelle was near a mitochondria, not near the nucleus. That's why it was so deceptive. Ribosomes were embedded on its surface. I found electron microscope images like this with rER located just next to mitochondria so it doesn't matter really if it's near nucleus or not.
  7. II know that some (quite big) part of my classmate chose endoplasmic reticulum (proteins for exocytosis) but some (including me) chose sarcoplasmic reticulum. While one of the best students in our class picked rough endoplasmic reticulum pointing that actin is a fibrous protein so i has mainly secondary sturcture and does not need any further modification so it will be just synthesised and then exocitosised. Anyway I'm confused with this question... I chose sarcoplasmic reticulum too cuz I think I read on ib.bioninja before that the muscle fibres have this layer called the sarcoplasmic reticul
  8. II know that some (quite big) part of my classmate chose endoplasmic reticulum (proteins for exocytosis) but some (including me) chose sarcoplasmic reticulum. While one of the best students in our class picked rough endoplasmic reticulum pointing that actin is a fibrous protein so i has mainly secondary sturcture and does not need any further modification so it will be just synthesised and then exocitosised. Anyway I'm confused with this question... I chose sarcoplasmic reticulum too cuz I think I read on ib.bioninja before that the muscle fibres have this layer called the sarcoplasmic reticul
  9. i said it was the RER itself, now you're making me doubt my answer It's most definitely rER because the source of the picture was /RoughER.gif
  10. So how did it go? I'm quite satisfied with paper 2, section B was great. I wasn't overly fond of paper 1 though.
  11. I was in a similar situation a year ago and I managed to learn the whole material in 2 weeks after I neglected the past 2 years of the course and eventually got 5 on my exams, however, I did not attend school at that time. I studied from 9 am to 12 pm and at first I was devastated when I looked up the syllabus and realised how screwed I am but then as I was studying it felt that it is manageable (stress is an incredibly good motivator). My school did not allow for skipping classes but I ignored them anyway because what could they possibly do to me? I don't know what the case is with your schoo
  12. I highly recommend this guy http://www.youtube.com/user/richthornley/videos?view=1&flow=grid He's an IB Chemistry examiner and explains every point of syllabus . I also use khanacademy. Good luck !
  13. Hi , I'm writing IA, in which I try to determine mass percent of CaCO3 in an eggshell but I have a problem with formulating a hypothesis. My teacher suggested that my hypothesis should be that I assume that there's no CaCO3 in the eggshell, however, I thought that my hypothesis should be supported by literature (which says that there's about 95% CaCO3). Do you think that hypothesis that my teacher suggested is appropriate? I calculated that it is approximately 91% if that can be of any help. Thanks!
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