Okay high school science...can I think back that far?
Mitochondrion are those little organelles in a cell (not all cells) that basically provide the energy. It's really a key component to cell growth, I think, too. That's all I can remember.
My question is a riddle from Alice Through the Looking Glass: How is a raven like a writing board?
A sub cellular organelle that acts as the "ower plant" of the cell. Has its own DNA (and we're doing a lot of research about diseases linked with mitochondrial DNA). Since you appear to be asking the questions here, I'll leave that one to you.