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Put the following steps of Koch's postulates in order: a. The suspected infectious agent must be isolated and grown outside the host. b. The suspected infectious agent causes the disease when it is introduced to a healthy, experimental host. c. The suspected infectious agent must be found in every case of the disease.
Plant cells have chloroplasts for photosynthesis, a vacuole and cell wall. Cell membranes allow certain substances into and out of the cell. Mitochondria provide energy from respiration for the cell, and the cell wall provides structure and is freely permeable. Yeast cells, algae and bacteria have cells walls.