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Affinity of ADP

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Affinity of ADP

Postby hannahzarzar » Sun Jan 16, 2011 3:41 pm

The ∆Go’ of the reaction acetyl phosphate + ADP ⇌ acetate +ATP is -2.8 kcal/mol. Molecule for molecule, acetyl phosphate has (greater, lesser, equal) free energy than does ATP relative to its dephosphorylated compound; ADP has (greater, lesser, equal) affinity for phosphate than acetate. Circle the correct answer.

I believe the first answer is equal, because acetyl phosphate + ADP is the same as ATP, and I think the answer to the second part is greater. Is this correct?
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Postby JackBean » Sun Jan 16, 2011 6:01 pm

1) it cannot be equal, as the G0 is non-zero.

2) it has to be opposite for both possibilities.

3) Look on the sign of G0 (+/-) and from that guess, which way is prefered
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Re: Affinity of ADP

Postby hannahzarzar » Thu Jan 20, 2011 4:04 pm

So, it has to be greater for the first and lesser for the second.
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Postby JackBean » Fri Jan 21, 2011 8:40 am

I think so
http://www.biolib.cz/en/main/

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Re: Affinity of ADP

Postby hannahzarzar » Sun Jan 23, 2011 12:33 am

But that would mean (in the second part) that ADP has less of a pull to phosphate than to acetate. Could that be right??
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