Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: Saturated hydrocarbons hydrocarbons contain only single bonds between carbon atoms.

Answer: What hydrocarbons contain only single bonds between carbon atoms?


Question: Plasma membranes encloses and defines the borders of cells.

Answer: What encloses and defines the borders of cells?


Question: Newton (n) is the si unit for weight.

Answer:
What is the si unit for weight?