churn in American English. churnverb [ I/T ] [ I ] The water was churning and the boat was rocking. [ M ] The fish churned up the water when we threw them some food. [ T ] fig. Seeing the car ahead flip over churned his stomach.
Animal cells and plant cells both contain: 1  cell membrane. 2  cytoplasm. 3  nucleus. mitochondria.
The endoplasmic reticulum membrane system, together with the Golgi apparatus, is responsible for protein processing and modification and lipid synthesis. Animal cells have a well regulated cell cycle which is controlled by cyclin-dependent protein kinases.