I think it should be the nucleus since that is the organelle which contains the DNA and thus regulates cellular processes?
It’s the cerebral cortex that is damaged and that damage and the cerebral cortex is located in the frontal lobe.
Answer: The length of the cell in millimetres is 0.0015.
Explanation:
Given conversion :

Thus 
Given : Length of the cell = 1.5 micrometers 
To find: Length of the cell in milllimeters (mm)
Length of the cell in milllimeters (mm) = 
The length of the cell in millimetres is 0.0015.