I'm not sure specifically what a 'catherine cell' is in this context as the term is rather unclear. It could be a very specific or made - up concept within that particular story.
A cell can be compared to a school as follows. The cytoplasm is like the general school environment. All the other organelles (like students and teachers) exist within it. The ribosomes are the study desks where the important work of protein synthesis (like students studying) occurs. The endoplasmic reticulum is like the school's internal communication system that transports important things around, similar to how it transports proteins in a cell.
It could be someone from Goku's past who has a vendetta against him and takes advantage of the chaos during the Cell Games. For instance, an old enemy who was thought to be defeated but managed to come back stronger and wants to finish Goku off while he's weakened from the fight with Cell.
Well, a cell graphic novel is really cool. It combines the visual appeal of art with the storytelling of a novel. The cells are like little windows into the story world. They can show characters' expressions, settings, and the flow of events. It's different from a regular novel as it gives a more immediate and visual understanding of what's going on. For example, in a mystery cell graphic novel, the cells might show the detective finding clues in a dark alley, which is more vivid than just reading about it in text.
Well, Miracle on Cell No. 7 is not based on real events. It's a made-up tale that aims to touch people's hearts and evoke emotions through its imaginative plot and characters.