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.
Genes Under Control: Scientists Develop Gene Switch for Chloroplasts in Plant Cells. Apr. 13, 2010 â The organelles of photosynthesis -- the chloroplasts -- have their own DNA, messenger RNA and ribosomes for forming proteins. Scientists have now discovered how to regulate the formation of proteins ...