Re:Of course! (Score 1)

Yeast is a fungus not a bacteria. But you knew that. All fungii can in shorter spans live without oxygen by fermentation
but the byproduct (alcohol) will kill them quite rapidly.

But there are other reasons why it is unpossible for a fungii to live on the outside of MIR.
First the temperature is low, slowing the life speed down.The sun could warm the surface,but not enough.
The second is the lack of water, fungii need water to feed, and I'm certain that the water would
1) freeze
2) evaporate, making survival impossible.
And thirdly the first issue with the toxication of the fungii by it's byproducts of fermentation.
So I'm quite certain that the fungii found on the MIR was inside where it's warm, damp and lot of nice things to eat like dead human
cells :).
There are bacteria that can live without oxygen. These are called Arcaebacteria and lives in sulfur vents
on the bottom of the sea and in rock and similar places. One could phantom one of these living in the hull of MIR.
But how would they be transfered from the rock to MIR and would they find sulpur to live on\in...