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  1. I

    biology paper 1 doubts

    We definitely know that the water potential of the solution is higher (less negative) because the plant cells were more turgid. Also, since the water potential of the solution is higher than that of the plant cells, water entered the plant cells by osmosis and increased the water potential over...
  2. I

    biology paper 1 doubts

    I'm expecting a pretty high GT, maybe around 36.
  3. I

    HOW WAS BIOLOGY PAPER 12 ?

    We're all discussing here: http://www.xtremepapers.com/community/threads/biology-paper-1-doubts.20936/page-26
  4. I

    biology paper 1 doubts

    Hello everyone, I just came from school, and I've missed most of the discussions. If anyone's interested, here are the answers that I remember. Actual size of cell = 50 micrometers In prokaryotes, ER is absent and DNA is the genetic material Lysosomes and Golgi apparatus have single membranes...
  5. I

    biology paper 1 doubts

    Paper was extremely easy, everything was direct and straight to the point.
  6. I

    HOW WAS BIOLOGY PAPER 12 ?

    To be honest, I found the paper very easy. If any of you studied the material (rather than just solving past papers all the time), then it was a piece of cake. Questions were straight to the point, and many questions were repeated.
  7. I

    D is a molecule of glycerol. R groups can only be alkyl groups or their direct derivatives, not...

    D is a molecule of glycerol. R groups can only be alkyl groups or their direct derivatives, not a glycerol molecule!
    • Irfan1995
    • Profile post comment
  8. I

    biology paper 1 doubts

    Oh come on, you MUST see mitochondria at high power. I mean, mitochondria are 500 nm long, and the minimum visible length is 200 nm. I agree with everything else. That's all I have time for today. Good night everyone, and good luck tomorrow! I hope that I've at least helped some people with...
  9. I

    biology paper 1 doubts

    Well, if they previously mentioned that it wasn't visible, then I would say it's not visible. But if they asked me to draw a cell in a practical exam, I'd draw the mitochondria.
  10. I

    biology paper 1 doubts

    Yes, that would be right. Maybe the Cambridge examiners are a bit too old and need to get their eyes fixed to see more clearly.
  11. I

    biology paper 1 doubts

    I don't really understand your question :(
  12. I

    biology paper 1 doubts

    Hmm, mitochondria are about 0.5 micrometers long. And my school's lab have microscopes that reach up to x400 and I can see them with no problem (although they are a bit tiny)
  13. I

    biology paper 1 doubts

    20) Interphase occupies over 90% of a cell's time. With cancers, they divide uncontrollably, so cell divisions are almost one after the other, so they have a much shorter interphase time. 26) Only pressure potential can be positive, so that means only X can be the pressure potential. Also, you...
  14. I

    biology paper 1 doubts

    Actually, just because W doesn't have any plasma protein doesn't mean that it's automatically tissue fluid. It could also be lymph. You can't also say that Z is lymph because it lacks RBCs, because tissue fluid doesn't have any RBCs as well. Also, lymph has NO plasma protein at all.
  15. I

    biology paper 1 doubts

    That's what I meant! An partially positive hydrogen atom DOES NOT form a hydrogen bond with an ADJACENT atom, but it can form a hydrogen bond with a much further one.
  16. I

    biology paper 1 doubts

    Very few: 1) Mitochondria 2) Chloroplasts 3) Nucleus With very high magnifications, you can see the following: 4) Centriole (only one, not two) 5) Golgi apparatus (although it's a bit blurry) 6) Nucleolus. You can see pretty much anything longer than half the wavelength of violet light. The...
  17. I

    biology paper 1 doubts

    W does not have any plasma proteins (i.e. proteins coming from blood capillaries). So you can immediately eliminate answers A and B X is at a lower pressure than Y. This means that X is at the venule end and Y is at the arteriole end. So X is blood entering capillaries and Y is blood leaving...
  18. I

    biology paper 1 doubts

    Volume of the ventricle stays constant. Volume of the blood in the ventricle decreases, but the amount of cardiac muscle in the ventricle stays the same. Take it this way, lets say you have a 8x2 rectangle. The area is 16 square units. When it "contracts", it becomes 4x4. The area is still 16...
  19. I

    biology paper 1 doubts

    Don't worry, ask as many questions as you like :) You have to know that DNA replicates during interphase (before cell division). So DNA replicates during part A.
  20. I

    biology paper 1 doubts

    Yes. That's right. Think of it this way. Lets say that cell A has a water potential of -100kPa and cell B has a waer potential of -200kPa. Cell A has a higher water potential because -100 is greater than -200. And cell A has a less negative water potential. So less negative = higher water...
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