26.If a paramecium’s contractile vacuole stops working, what might happen to the organism? A. It would shrink. B. It would stop making proteins. C. It would stop doing cell respiration. D. Its chromosomes would not replicate. E. It would fill with water and lyse. 27.Which of the following is found in plant cells but not animal cells? A. Nucleus B. Lysosomes C. Golgi complex D. Central vacuole E. Chromosomes 28.The endosymbiont theory is supported by the following evidence except: A. Mitochondria are surrounded by two membranes. B. Mitochondrial ribosomes are similar to bacterial ribosomes. C. Mitochondria contain circular molecules of DNA. D. Mitochondria divide by binary fission. E. Mitochondria have a matrix. 29.Which of the following causes a dividing cell to pinch in two by contracting like a purse string? A. Microtubles B. Actin filaments C. Intermediate filaments D. Centrioles E. Pili 30.Which process would enable a white blood cell to ingest a bacterium? A. Diffusion B. Receptor-mediated endocytosis C. Phagocytosis D. Pinocytosis E. Osmosis 31.When a cell membrane engulfs fluid droplets it is called: A. diffusion B. receptor-mediated endocytosis C. phagocytosis D. pinocytosis E. osmosis  Â