where does the kreb cycle and ETC take place in prokaryotes?

[mrh125]

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Do they all take place in the cytosol? Up until recently i thought prokaryotes had folds in their plasma membrane where these reactions take place or is that just in the case of the etc?

 

[sazerac]

You got it.

The ETC machinery sits on a membrane, and prokaryotes only have one membrane*, the plasma (cell) membrane.

Krebs is just a bunch of enzymes sitting around maintaing their equilibria in a big circle-jerk. It takes place in the cytosol of a prokaryote.




* ignoring the magnetosome of course.

 

[Arayh]

Furthermore, because they don't have mitochondria, they have no need to use energy to shuttle cytosolic NADH into mitochondria for the ETC, which means they are more "productive" per glucose metabolized than we are, and will generate more ATP per glucose on average.