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  1. M

    A level Biology: Post your doubts here!

    Don't worry about it it'll be the opposite tomorrow. I never timed myself at home but always manage to do it in time with time left for revision. Only in Chemistry do I finish exactly on time in the paper itself. If you manage exactly on time right now I can assure you you'll be done by 50...
  2. M

    A level Biology: Post your doubts here!

    Alright, my turn to ask questions. This question is all over the page so taking two screenshots. Okay I got rid of A cause I know that capillaries have the highest "total" cross sectional area (for increased diffusion). I got rid of B for the same reason. Now to C and D. Both have the same...
  3. M

    A level Biology: Post your doubts here!

    Before mRNA leaves nucleus, the DNA should have replicated and an mRNA strand should have been synthesized, i.e. transcription. However, the DNA being replicated is not part of the question because the very first statement says that the events being discussed are from transcription. I made the...
  4. M

    A level Biology: Post your doubts here!

    Beautifully compiled. I think this is the most. In fact directly I've only seen prokaryote, eukaryotic cell, and the cell membrane one, but yeah rest are good too. Also it helps to learn ribosomes in S units too. 70S in prokaryotic cytoplasms, as well as the stroma of chloroplasts and matrix of...
  5. M

    A level Biology: Post your doubts here!

    Ugly question again. I got this wrong too when I did it first. I googled it and turns out this is an actual thing. Apparently, it's just a fact that we are expected to know. -_- Worst thing is, the options have '2 only' and '3 only' so we can't even eliminate the options. *facepalm* I guess...
  6. M

    A level Biology: Post your doubts here!

    I absolutely HATE the way CIE asks about this topic. I have some very ugly questions about this topic. Here it goes: 1. COMPANION cells' membranes have H+ pump carrier proteins that use ATP (active transport) to pump the H+ ions from within the companion cells to the cell walls/outside the...
  7. M

    A level Biology: Post your doubts here!

    Very cheeky question. I got it wrong the first time I did it. I did A too. But I think we should visualize what's happening before choosing the option. Think about it. Hungry enzymes, all vacant, free to get a hold on those delicious substrates. Then why would the conc. of ES complexes rise...
  8. M

    A level Biology: Post your doubts here!

    You're ever welcome man!! This truly means a lot and I do this happily because if it weren't for the internet I wouldn't have half the knowledge I have today. I stopped going to school in the last 6 months cause school didn't cut it. Self-studying FTW, and posts I read by other members on...
  9. M

    A level Biology: Post your doubts here!

    Know which ones are by viruses and which ones are by bacteria and which ones are by the protists. HIV, smallpox, and measles are all by viruses. TB and cholera are by bacteria. Malaria is by a protoctist. In your question, the HIV and measles are the ones by viruses. Since they are asking the...
  10. M

    A level Biology: Post your doubts here!

    I hope my previous post made sense. Now I'll directly address the question. Q28: What the scientists basically found is that the curve looks similar to that of the Bohr effect, i.e., the curve is to the right the same way it is to the right when there is a higher carbon dioxide partial...
  11. M

    A level Biology: Post your doubts here!

    The Tale of Haemoglobin Affinity Curves and the Bohr Effect (dedicated to darks and some other folks on here who might have an issue with this topic) You need to understand what that gorgeous curve actually represents. Take it out from your book as you read this. The x axis depicts the partial...
  12. M

    A level Biology: Post your doubts here!

    Hahah coincidence indeed. BTW I think they don't refer to killer T cells although what you said about killer T cells is correct they DO get at the site and release cytotoxins, I just checked. But that would make option C the most correct option as it says 'They can leave the blood and excrete...
  13. M

    A level Biology: Post your doubts here!

    I think here you have to think from a different perspective. Yes we may not remember that T lymphcytes leave the blood or not. But we reject A because of the 'only found in blood' part. They AREN'T only found in blood because how can that be true when you know that they are produced in the bone...
  14. M

    A level Biology: Post your doubts here!

    Question 4 The majority of candidates answered this incorrectly. A build-up of lipids in cells means that the excess lipids are not being broken down. Excess lipids are normally broken down by hydrolytic enzymes found in the lysosomes. This is what the examiner report says. This is one of the...
  15. M

    A level Biology: Post your doubts here!

    Guys, I think you all are misreading the statement. Took me long enough but we're really dumb if none of us noticed this (I'm referring to shahzaib ihsan's question above). 30 What does not help to maximise uptake of oxygen as blood flows through capillaries in the lungs? A Dissociation of...
  16. M

    BIOLOGY PAPER 34 MAY/JUNE 2017

    Use the rules we use in Physics, i.e., keep the significant figures equal to the least accurate value used in the calculation. Measure the lengths by your ruler, they'd be accurate to 1 mm. Something like 5.4 cm would be written as 54 mm or 54000 micrometer. Everything should be in 2 sig fig...
  17. M

    CHEMISTRY PAPER 3 DOUBTSS!!

    Yeah man got a lab set up in my basement, did some 10 years of practicals in one go. Gonna take a power nap for 30 mins and perform more practicals till sunrise. Jk man did the same. Good luck to you too!!
  18. M

    CHEMISTRY PAPER 3 DOUBTSS!!

    Of course, Fsc.'s situation is wayy out of hand. But baby steps like this are going to compromise the reputation in the long run. I know about group chats on whatsapp where the enitre paper of confidential instructions itself is sent. Confidential instructions clearly say the following: "Great...
  19. M

    CHEMISTRY PAPER 3 DOUBTSS!!

    Thank you. Nahaayat afsos ki baat hai ye. This is an extremely tight dilemma. The entire paper is being shoved in our faces even for those who want to maintain some degree of honesty for their own self-esteem and integrity. At the end of the day I want to be truthful to myself. But this is...
  20. M

    A level Biology: Post your doubts here!

    Okay very interesting picture haven't seen anything like this before. o_o But let's see, you got the basic idea down and you seem to have decent drawing skills so be proud of that. The nucleus is perfect, no need to dot or anything. That's risky because dots if you ever draw them should be...
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