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Thread: when chemistry meets biology

  1. #1 when chemistry meets biology 
    Forum Freshman lince!'s Avatar
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    well this will be related to both chemistry and biology

    what i know about chemistry-
    breaking bonds is an endothermic reaction
    building up bonds is an exothermic reaction

    what i learnt from biology- ADP and ATP
    (well, can i assume the people here know about ADP and ATP?)
    to attach a Pi to ADP requires energy
    to detach a Pi from ATP to form an ADP gives out energy

    is there a contradiction between chemistry and biology or i took any of them wrongly?

    8)


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  3. #2  
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    No there is no contradiction. The problem is in A level biology (or the equivalent where you live) you are only told the simplified version of the reaction.

    When ADP is formed from ATP, it involves breaking a bond to give yield the free phosphate, which like you said, costs energy. However the phosphate released will quickly react with one of three amino acids with a hydroxyl group (serine, threonine and tyrosine) which is why you talk about the hydrolysis of ATP. As the new bond formed is covalent, it has a higher bond enthalpy value than the original bond broken, therefore the overall reaction is exothermic. Hope that makes sense.


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  4. #3  
    Forum Freshman lince!'s Avatar
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    yes! thanks
    i was just expecting some other unknown reaction that may be an exothermic reaction requires higher energy.
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