1. Prokaryotes lack organelles such as nucleoli, mitochondria, plastids, Golgi apparatus, and do not exhibit cyclosis. 原核生物无细胞器，如核仁、线粒体、质体、高尔基体等，不出现胞质环流。
2. Cyclosis (cytoplasmic streaming) The streaming of cytoplasm in a circular motion around the cell observed in some plants, particularly young sieve tube elements. 胞质环流（胞质运动）：在一些植物细胞特别是在幼筛管分子中观察到的细胞质围绕细胞的环形流动的现象。
3. It also controls motility, cellular movements, and cyclosis. G-actin can polymerize into helical strands that coil together to form microfilaments called fibrous actin(Factin). G-肌动蛋白可以聚合成为螺旋状的结构继而盘绕形成微丝，通常被称为含纤维的肌动蛋白（F-肌动蛋白）。
