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  1. H

    A level Biology: Post your doubts here!

    what will happen to the mitochondrion if it is placed in a concentrated solution........k exoosmosis will iooccur bt cn smone explain what effect the membranes in particular the crista experience.......
  2. H

    A level Biology: Post your doubts here!

    Explain, using examples, how the environment may affect the phenotype of an organism. [8] please anyone answer this question........i never seem to understand this question answer in the marking schemes...... also Describe the maturation of a spermatid into spermatozoan? regards this question...
  3. H

    A level Biology: Post your doubts here!

    http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9700%20-%20Biology/9700_w08_qp_5.pdf Q2.b(ii) http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9700%20-%20Biology/9700_w08_ms_5.pdf see ms....why he is penalising 3 dp......there's no reason he can do that...
  4. H

    A level Biology: Post your doubts here!

    why the GP conc . falls in the graph.....ms of this question says that it falls since GP converted to TP but that defies every text book.....since gp cant be converted to tp in absence of nadph and atp
  5. H

    A level Biology: Post your doubts here!

    In preparation for in-vitro fertilisation (IVF), women are injected with FSH. Explain why treatment with FSH is a necessary preparation for IVF? http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9700%20-%20Biology/9700_w09_qp_41.pdf markscheme is cnfusing
  6. H

    Chemistry / biology /physics applications

    sorghum's BULLIFORM CELLShttp://en.wikipedia.org/wiki/Bulliform_cell
  7. H

    Physics: Post your doubts here!

    part B
  8. H

    Physics: Post your doubts here!

    http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_s09_qp_4.pdf q9
  9. H

    Physics: Post your doubts here!

    part(B)?
  10. H

    Physics: Post your doubts here!

    Q.Outline the principles of the generation of ultrasonic waves using piezo-electric transducer? 4marks
  11. H

    Chemistry / biology /physics applications

    PRODUCTION OF MONOCLONAL ANTIBODIEShttp://highered.mcgraw-hill.com/sites/0072556781/student_view0/chapter32/animation_quiz_3.html
  12. H

    A level Biology: Post your doubts here!

    why tumour cells are used to form hybridoma? (well MARY JOnes says that since plasma cells do not divide they can't be used alone for producing antibodies)
  13. H

    A level Biology: Post your doubts here!

    LARINA - do chek out http://www.biologymad.com/ under AS level ....there ll be a subheading hormones
  14. H

    Chemistry / biology /physics applications

    yea thats upto you!
  15. H

    Chemistry / biology /physics applications

    for the graph in question 10 c.....since it is amplitude modulation.....frequency of modulated wave will be same as carrier wave....i.e 50 KHz....this corresponds to a time period of 20microseconds.....while the change in amplitude from max-min-max will occur with a frequency of 5KHz ...i.e...
  16. H

    Physics: Post your doubts here!

    brother : firstly u cant use F=BIL here cos its a solenoid kind of arrangement! bt however....the result from solenoid formulae will be the same....i.e E ends up being proportional to -dI/dt since(B=knI)(wid k being a constant and n number of turns) the main problem is the graph u drew...... do...
  17. H

    Physics: Post your doubts here!

    check out my physics chem bio application thread.....there i have posted many links for youtube lecture vids specific to application topics
  18. H

    Chemistry: Post your doubts here!

    FOR part(ii) ......it seems rather counter-intuitive to me that F groups repel the water molecules......can't they form H bonds with water.....bt markscheme says CF3 part can't form H-BONDS wid water
  19. H

    Chemistry: Post your doubts here!

    yea thanks.....bt one thing abt the the bracketed thing u mentioned:see in DNA and protien's alpha helix structure th H-bonding is b/w CO and NH groups......so th criteria u mentioned is only necessary to be fulfilled by one of the molecules amongst the two involved in H-BONDING
  20. H

    Chemistry / biology /physics applications

    MEDICAL PHYSICS X-RAYS http://www.antonine-education.co.uk/Physics%20A%20level/Options/Module_6/Topic_7/topic_7_x.htm
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