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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.
Structures Found Only in Plant (and Some Algae and Fungal) Cells Now, we move on to the fun stuff that you only wish you had in your cells. It's okay to be jealous. Cell Wall Like the cell walls in bacteria, fungi, algae, and some archaea, plant cell walls are found just outside the plasma membrane and provide the cells structure and protection. The Cell Wall: Not Yours. The cell wall prevents plant cells from bursting (lysing) when too much water moves into the cell across the membrane. As water pushes against the cell wall from the inside, plant cells become large and firm because pressure, known as turgor pressure, builds up against the inside of the cell wall.