Structural features that contain the protein actin and help to control the shapes of cells are a. plastids. Four of the five statements listed below are portions of a well-known theory. Select the exception. All organisms are composed of cells. Cells are the basic living unit of organization of living things.
All cells have a nucleus.
Four of the five answers listed below are types of intercellular connections. Select the exception. Some membranes have proteins with channels or pores that allow for the passage of hydrophilic substances. Hydrophilic substances have an easier time passing through membranes than do hydrophobic substances. The current concept of a membrane can be best summarized by the fluid mosaic model.