It might not be related, but they've found mold inside the reactor room of Chernobyl. Apparently it's evolved a chlorophyll like molecule that captures gamma radiation. It's literally living of the energy that makes the environment lethal to almost anything else (organic or electronic).
Edit. Just checked and it's not confirmed how it's growing. They do know it grows significantly faster in a high radiation environment. They haven't pinned down the exact biological mechanism.
Unlikely. Biochemistry, as we know it, relies on a carbon-carbon backbone. That breaks down long before the temperatures on the sun's main outer layers. The electrons get stripped off, and chemistry, as we know it, stops working.