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

[Q]: Phosphate groups are found within phospholipids and nucleotides.
[A]: Phosphate groups are found within phospholipids and what else?


[Q]: Rod is the general shape of centrioles.
[A]: What is the general shape of centrioles?


[Q]: The ice crystals that form on the ground are called frost.
[A]:
What are the ice crystals that form on the ground called?