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  1. CommonSense

    The End Of The Word

    pancreas
  2. CommonSense

    The End Of The Word

    yelp
  3. CommonSense

    A2 Biology | Post your doubts here

    2.5 ATP are actually produced per 1 reduced NAD and about 1.5 per reduced FAD. Per one glucose molecule, 2 reduced NAD are produced in glycolysis, 2 in the link reaction, 6 in the krebs cycle. 2 reduced FAD are produced in the Krebs cycle. Therefore, a total of 28 ATP molecules are produced by...
  4. CommonSense

    A2 Biology | Post your doubts here

    mRNA is transcribed from the gene coding for insulin and there is plenty of it in the beta cells whereas DNA contains all the genes and therefore would require restriction enzymes to cut out the insulin gene.
  5. CommonSense

    A2 Biology | Post your doubts here

    I suggest that u start with the last question. I find it to be easy marks.
  6. CommonSense

    A2 Biology | Post your doubts here

    To save you some reading, if u dont know what in situ means, it just means that bacteria can do the work underground rather than having to mine the rocks first.
  7. CommonSense

    A2 Biology | Post your doubts here

    Errors in the MarkScheme??! 43/O/N/11 Q11 b Chiasma formation in metaphase I? Isn't it supposed to be late prophase I? 41/O/N/10 Q9 a Males homogametic? Aren't they supposed to be heterogametic? and finally... 43/M/J/10 Q7 c Anaerobic respiration in yeast involves ethanal dehydrogenase? Isn't it...
  8. CommonSense

    A2 BIOlOGY- Phenotype

    May you please explain the portion in red? phenotypic variation results from interaction of genotype and environment / VP = VG + VE ; environment may modify expression of gene(s) ; must be stated e.g. for size / mass / height ; because, food / nutrient / ion, missing or in short supply ...
  9. CommonSense

    A2 Biology - Error in CIE MarkScheme?!

    43/O/N/11 Q11 b Chiasma formation in metaphase I? Isn't it supposed to be late prophase I? 41/O/N/10 Q9 a Males homogametic? Aren't they supposed to be heterogametic? and finally... 43/M/J/10 Q7 c Anaerobic respiration in yeast involves ethanal dehydrogenase? Isn't it supposed to be alcohol...
  10. CommonSense

    Can't connect to https://myresults.cie.org.uk

    I can't open it too .. I feel almost dead
  11. CommonSense

    chem MCQ plz help

    because the shape of D is tetrahedral. You gotta imagine the 3D shape and that u removed some atoms to mke it a 2D shape. Count the number of atoms in the flat shape u get. With D it is Si and 2 flourines because chlorine reacts with hot concentrated NaOH to give the chlorate(v) ion ie ClO3-...
  12. CommonSense

    CHEMISTRY!

    Find the Mr of the empirical formula ie 30 Divide the number of kg of the carbohydrate by the Mr to get the number of moles of the carbohydrate As the mole ratio of the carbohydrate to carbon dioxide is 1 : 1, multiply the number of moles by the Mr of CO2 to get the mass in kg 1.8/30 = 0.06 0.06...
  13. CommonSense

    chem oct/nov 2010 p11 help

    U r most welcome :)
  14. CommonSense

    chem may/june 2010 p11 help

    Use Hess's law for this question. Follow this pathway: From iodinesolid to gas (+38) then to iodine tetrachloride (-214) We then divided by 2 because the question is asking for the standard enthalpy change of formation of 1 mole of iodine tetrachloride not 2. So the ans is B The oxidation...
  15. CommonSense

    chem oct/nov 2010 p11 help

    The mass of nickel is 20% * 10 = 2g The Ar of nickel is 58.7 so the number of moles is 2/58.7 Multiply the number of moles by Avogadro's constant ie 6.02E23 (which is the number of particles per mole) and u will get the answer A Energy = mass * specific heat capacity * temperature change = 200...
  16. CommonSense

    Arabic as first language paper 1 disussion

    I think this is what most of us wrote but still it doesnt make sense to me. the guy used an example to clarify his means, so what? why should it have 6 marks unless there is more to the answer than that.
  17. CommonSense

    Chemistry MCQ thread...

    I am sorry if u think I am picky, but hydrocarbons donot contail oxygen. You could have said organic compounds just to be more accurate. :sorry:
  18. CommonSense

    Chemistry MCQ thread...

    the general formula for an alcohol is CnH2n+1OH. So when combusted, nCO2 will be formed and (2n+2)/2 water will be formed. for that u will need [2n+{(2n+2)/2}-1]/2 oxygen molecules. Simplifying this will give us: CnH2n+1OH + (1.5n)O2 --------> nCO2 + (n+1)H2O Example: C5H11OH + 7.5O2...
  19. CommonSense

    CHEM MCQ HELP

    the answer for 15 is B because only 1 mole of carbon dixide is produced whereas A does not decompose, C produces nitrogen dioxide and oxygen and D produces water which is not a gas at room temperature and pressure. the answer for 16 is A because there was no change in the oxidation number of...
  20. CommonSense

    Kp changes?

    Temperature also affects Kp because if u reduced the temperature in a closed system, pressure decreases. Have a look at 9701/1/M/J/01 Q 9. The answer is B, showing that temperature also affects Kp.
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