Final answer:
The cell structure is 1,100 µm, occupying one fifth of the 5,500 µm field of view at 40x magnification.
Step-by-step explanation:
If a field of view is 5,500 µm at 40x magnification, and a cell structure occupies one fifth of that field of view, the size of the cell structure can be found by dividing the field of view by 5. Therefore, the cell structure is:
5,500 µm / 5 = 1,100 µm.
The correct answer is a. 1,100 µm