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1

It would have to be vastly different to earth physiology but there are exothermic chemical reactions possible with compounds found on Titan. This may well not be the only hurdle though. For example without having a solvent for the redux reaction and a functional group for what ever the analog of enzymes would b in this system: using this energy would be ...


2

As an alternative, there is the possibility of an oxygen-free metabolism. Let us look at some standard enthalpies of formation from the various Wikipedia articles for a few simple species $\text{H}_2 = 0$ kJ/mol (definition for elements in their standard state) $\text{CH}_4 = -74.87$ kJ/mol (Wikipedia) $\text{C}_2\text{H}_6 = -84$ kJ/mol (Wikipedia) $\...


7

There are bacteria on Earth which get energy from hydrocarbons and oxygen. See for example this article. Many of them need oxygen which is not freely available on Titan. Some (thank's to @Calcutta for pointing this out) can use sulphate as an oxidising agent instead. However, as far as I can find out, essentially all the oxygen on Titan is in the form of ...


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