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Recent content by qdkhan

  1. Q

    Physics: Post your doubts here!

    In the circuit shown, let the current be I1 I1=V/R=6/2R Power dissipated in external resistor (P1)=I1*I1*resistance of external resisitor=(6/2R)*(6/2R)*R= 36R/(4R*R)=9/R in the circuit with negligible internal resistance, let the current be I2 I2=V/R=6/R so power dissipated in xternal...
  2. Q

    Physics: Post your doubts here!

    can anyone please explain q3 b(III) in the following paper? http://revision.peterhouse.co.zw/Physics/AS%20Level%20Physics/Paper%202s%20%20&%20Mark%20Schemes%20June%20&%20Nov/9702_s12_qp_21.pdf
  3. Q

    A level Biology: Post your doubts here!

    the answer is A because peptide bonds form only between COOH n NH2 grps which are attached to the central carbon atom. Grps 2 and 5 are part of the R grps of the two amino acids and hence cannot be involved in peptide bonding. these grps may be a part of the tertiary and quaternary structures of...
  4. Q

    A level Biology: Post your doubts here!

    the edition i m tokin abt is the third one, it must be in urs as well, eider at the end of transport in mammals or the heart chapter.....btw i am a sister ...
  5. Q

    A level Biology: Post your doubts here!

    anyone pls!!!
  6. Q

    A level Biology: Post your doubts here!

    P represents the contraction of the atrial walls, so it rrepresents the excitation wave sweeping ovr the atrial walls in response to which they contract. Q,R and S represent the wave sweeping ovr the ventricular walls which cause them to contract, and T represents the rrecovery of the ventricle...
  7. Q

    A level Biology: Post your doubts here!

    see d pollen grain at the far left had its pollen tube growing parallel to the eyepiece graticule so we calculate the increase in its length ovr d 4 hr period, which is 8 divisions. 50 divisions on graticule>0.1 mm 1 division>0.002 mm so increase in pollen tube's length= 8 * 0.002=0.016 mm...
  8. Q

    A level Biology: Post your doubts here!

    5th ryt? B is wrong bcz both mitochondria and chloroplasts have 70S ribosomes similar to that in prokaryotes. C is correct cz all mitochondria, chloroplasts and prokaryotes have small circular DNA molecules.
  9. Q

    A level Biology: Post your doubts here!

    th answer is A(A and AB) cz if O and B blood grp ppl receive A grp blood, they wd produce antibodies agnst A blood cells cz A antigens wd be recognised as foreign.
  10. Q

    A level Biology: Post your doubts here!

    check d answer agn, it is C. i jst dd
  11. Q

    A level Biology: Post your doubts here!

    can anyone please help me with q25, q31, 33 and 39? in 33, shdnt C be the answer cz patients can be yunger than 30. In 39, is A d answer cz soil condiditons donot really make a difference to nitrogen fixing bacteria as dey r in d nodules...
  12. Q

    A level Biology: Post your doubts here!

    it is C because CO combines irreversibly wd Hb< preventing it from combining wd Hb. So it shdnt really have any effect on diffusion rate of oxygen and CO cannot prevent oxygen release anyhow
  13. Q

    A level Biology: Post your doubts here!

    what about the vena cavae, should not a decrease in their blood pressure stimulate a rise in the cardiac output? shouldn't a well developed heart muscle mean a high pulse rate, cz that would mean the heart is pumping efficiently? plasmodium can be passed across the placenta (thats what my book...
  14. Q

    A level Biology: Post your doubts here!

    can anyone please help me with the following questions? q 26, 32 and 34 in O/N 2002 http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_w02_qp_1.pdf
  15. Q

    Physics: Post your doubts here!

    Salam! what does this mean"the oscillation died away"?
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