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  1. Hisham Khan

    A level Biology: Post your doubts here!

    Because of ph change due to H+ ions when complex change into product and medium gets too alkaline or too acidic.Enzyme can stop working because product act as uncompetitve inhibitor.You can't control that right?
  2. Hisham Khan

    A level Biology: Post your doubts here!

    so it ultimately makes us choose option D.Nothing is wrong in they showing us the complex conc from the top to the bottom anyway if it makes sense right?
  3. Hisham Khan

    A level Biology: Post your doubts here!

    Yes they do form but if they don't reach 0 over time with enzyme having no pain in the *** is something quite strange
  4. Hisham Khan

    A level Biology: Post your doubts here!

    maybe if something happened to enzymes the graph would be like a,for e.g it denatures so conc would not reach 0
  5. Hisham Khan

    A level Biology: Post your doubts here!

    Look A isin't correct because if you look carefully,you will see that the graph doesent reach 0.As conc of substrate is LITTLE in excess and enzyme remain unchanged no matter how many complexes form,there will be a tie when all substrate changes into product,all enzyme substrate complex changes...
  6. Hisham Khan

    A level Biology: Post your doubts here!

    Yeah that's right ..... Sorry I missed it or something ...
  7. Hisham Khan

    A level Biology: Post your doubts here!

    And D is pretty obvious for enzyme question as all enzyme substrate complex will change intro product.No rocket science I think.And they are telling you how conc of enzyme substrate complex changes over time not how it formed over time .
  8. Hisham Khan

    A level Biology: Post your doubts here!

    I didn't see the previous statements you people made....
  9. Hisham Khan

    A level Biology: Post your doubts here!

    If you read the previous question carefully,you'll notice that they say they pass through xylem by Apoplastic pathway ONLY.
  10. Hisham Khan

    A level Biology: Post your doubts here!

    Physics is better?. No u :{
  11. Hisham Khan

    A level Biology: Post your doubts here!

    Out of topic but listen to this once with headsets on....
  12. Hisham Khan

    A level Biology: Post your doubts here!

    Sadly ..... No
  13. Hisham Khan

    A level Biology: Post your doubts here!

    I might retake physics in Oct nov .I didn't do great in it.Inshallah will have time to focus on it entirely
  14. Hisham Khan

    A level Biology: Post your doubts here!

    Try solving whole past papers brohter :)
  15. Hisham Khan

    A level Biology: Post your doubts here!

    Is everyone alive?
  16. Hisham Khan

    A level Biology: Post your doubts here!

    True.Inshallah I might get above 50/60 in paper 2 in chem and A in bio as well if Allah wills but I'm literally shaking.The difficulty of chem mcqs makes you scared lol.
  17. Hisham Khan

    A level Biology: Post your doubts here!

    You know what?.I didn't know a single thing till march, not even what prokaryotes mean like srsly and how to calculate simple things in chem. I wasted all my time on silly things and a game called paladins(game like overwatch),I was acting really immature. I reached Masters (top 2% players in...
  18. Hisham Khan

    A level Biology: Post your doubts here!

    Q21:Which statement is correct for TUMOUR CELLS ONLY.Tumours cells are not the only cells with mutated dna. As there is rapid division of tumour cells which is in cancer ONLY,interphase takes less time, is answer. Q14:Vmax is the maximun rate at which a enzyme works right?. As substrate...
  19. Hisham Khan

    A level Biology: Post your doubts here!

    A** what is the best way to prepare yourself for the chemistry mcqs.:(
  20. Hisham Khan

    A level Biology: Post your doubts here!

    I did the same thing but there was something wrong in my calculation I suppose
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