Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Compounds containing an atom of nitrogen element, bonded in a hydrocarbon framework, are classified as amines.
Compounds containing an atom of what element, bonded in a hydrocarbon framework, are classified as amines?

Terrestrial biomes are classified by climatic factors and types of primary producers.
What are classified by climatic factors and types of primary producers?

The mitochondria organelles are known as the "power plants" of the cell.
What organelles are known as the "power plants" of the cell?