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A level Biology: Post your doubts here!
D since pressure decreases from capillary to vein and veins have lower thickess than arteries but more than capillaries. Although i dont get the velocity one graph :P -
A level Biology: Post your doubts here!
D, histamine is produced by body cells not antibodies. -
Chemistry: Post your doubts here!
Oh i understand now thank you so much :D And one more thing can sulfuric acid dehydrate carboxylic acid? -
Chemistry: Post your doubts here!
How to know atoms lie in the same plane/straight line? need help -
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Chemistry: Post your doubts here!
As the reactants react they produce auto catalyst with the products so the rate increases but later after some time the the rate will decrease due to low substrate concentration. -
Chemistry: Post your doubts here!
It says salt formation so the ratio of acid to calcium would be 2:1 for example for Butanedioic acid seperate into two parts and react it with calicum and it will look like this : CH2COO- + Ca2+ = (CH2COO)2 Ca And do that for the rest and so its formula will become C8H8O8Ca2 Divide by 2 and so... -
Chemistry: Post your doubts here!
Its B, since yellow ppt is formed by silver iodide. and Ba because group 2 sulfates solubility decreases down the group so Ba is less soluble than Mg and will form a precipitate. -
A level Biology: Post your doubts here!
but doesnt nucleus disappears at prophase and reforms at telophase? do you know the year this question is from? -
A level Biology: Post your doubts here!
I think its D since in telophase the two nucleus forms so each nucleus will have 2 DNA and besides in metaphase there is no nucleus to begin with -
A level Biology: Post your doubts here!
This is just perfect thanks(y) -
A level Biology: Post your doubts here!
im still a bit confused in this i dont understand the 2nd division part sorry for my dumbness -
A level Biology: Post your doubts here!
Bio Bombs Away!!! I understand that the objective lens should be x10 but why must the eyepiece lens be x5? -
A level Biology: Post your doubts here!
oh i see thanks :D apparently i confused the Haem group to nitrogen but is actually iron xD -
A level Biology: Post your doubts here!
Guys does Carbon dioxide combine with haem group of a haemoglobin molecule? -
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Chemistry: Post your doubts here!
The H+ ion in this full equation comes from sulfuric acid. 3CH3CH2OH + Cr2O72- + H+ = CH3CHO + 7H20 but this equation is out of the syllabus or for simplicity it is written as: CH3CH2OH + [O] = CH3CHO + H20 -
Chemistry: Post your doubts here!
No i was talking about the oxidation of alcohols to form Carboxylic acid and etc in which we oxidise by acidified KMnO4 and the acid used is usually sulfuric acid to acidify KMnO4. In dehydration of alcohol H2SO4 used as a catalyst.