Plant cells have an elaborate cytoskeleton of actin filaments, microtubules, and other proteins.
In small algae such as Chlamydomonas these actually enable to swim around, whereas in more advanced plants they are responsible for such tasks as moving chloroplasts into the best position to catch the sunlight without being damaged by it. Cyanobacteria and prochlorophyta are technically bacteria, and have a bacterial cell organization, but possess all the photosynthetic chemistry of green plants. Some cyanobacteria live in caves, where they survive on very little light and may play a significant part in precipitating calcite on stalactites and stalagmites. I have been studying these using confocal microscopy, electron microscopy and physiological methods. The prochlorophytes are particularly interesting from the point of view of cell evolution since they seem to be long-lost descendants of the ancestor of the chloroplast of green plants.