TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: The active transport of ions across the membrane causes an electrical gradient to build up across the plasma membrane.

SOLUTION: The active transport of ions across the membrane causes an electrical gradient to build up across the what?

PROBLEM: Proteins are long chains of amino acids.

SOLUTION: What are long chains of amino acids?

PROBLEM: Neurodevelopmental disorders happen when development of nervous system is disturbed.

SOLUTION:
What happens when development of nervous system is disturbed?