instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Phototaxis is the term for movement toward light.
answer:
What is the term for movement toward light?

question:
Some materials have negative heats of solution; the dissolution of one of these solutes in water is called?
answer:
Some materials have negative heats of solution; the dissolution of one of these solutes in water is called?

question:
The cell membrane consists of two adjacent layers of phospholipids.
answer:
The cell membrane consists of two adjacent layers of what?