Only see surface view -no internal detail visible. Infinite depth of focus, in contrast to light scopes. R.P. around 2 nm at best, usually a bit poorer. Mount on block and scan. Some procaryotes do have internal compartments.
Some eucaryotic cells are very small.
Some eucaryotes don't have sexual cycle. Distinctive eucaryotic features Nucleus . Multiple replication origins . During division, chromatin condenses by tight coiling into chromosomes, may be visible in light microscope. Specialized cell division that reduces chromosome set by half.