TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Proteins are long chains of amino acids.

SOLUTION: What are long chains of amino acids?

PROBLEM: Collision theory states that chemical reactions occur when atoms, ions, or molecules collide.

SOLUTION: What states that chemical reactions occur when atoms, ions, or molecules collide?

PROBLEM: The effect of acetylcholine in heart muscle is inhibitory rather than excitatory.

SOLUTION:
The effect of acetylcholine in heart muscle is inhibitory rather than what?