Animal cells adhere together strongly through ., which are supported by intermediate filaments O a. cellulose fibers b. desmosomes c. plasmodesmata d. tight junctions O e. gap junctions
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- Diseased animal cells may produce molecules thatactivate death cascades to kill the cells in a controlledmanner. Why would neighboring healthy cells also die?a. The death molecule is passed throughdesmosomes.b. The death molecule is passed throughplasmodesmata.c. The death molecule disrupts the extracellularmatrix.d. The death molecule passes through gap junctions.Describe the structural characteristics of cells that are highly specialized todo the following: (a) synthesize and secrete proteins, (b) actively transportsubstances into the cell, (c) synthesize lipids, and (d) phagocytize foreignsubstances.The gap junctions of animal cells differ from the plasmodesmata ofplant cells in thata. gap junctions serve as communicating junctions and plasmodesmataserve as anchoring junctions.b. gap junctions prevent extracellular material from moving betweenadjacent cells but plasmodesmata do not.c. gap junctions allow for direct exchange of cellular material betweencells but plasmodesmata cannot allow the same type of exchange.d. gap junctions are formed by specialized proteins that form channelsthrough the membranes of adjacent cells but plasmodesmata areformed by connecting the plasma membranes of adjacent cells.e. All of the above are correct.
- Endoplasmic reticulum is an important part of endomembrane system of a cell. Explainhow the structure of endoplasmic reticulum depends on cell specialization.Vacuoles are fluid-filled organellespresent in some cells.Which function isNOT normally performed by vacuoles?Joins the intermediate filaments in one cell to those of a neighboring cell a) Adheren Junctions b)Hemidesmosomes c)Tight Junctions d)Desmosomes e)Gap Junctions
- Which is/are true of epithelial cells?a. They can only move uncharged molecules across their surfaces.b. They may have segregated functions on apical (luminal) and basolateralsurfaces.c. They cannot form tight junctions.d. They depend upon the activity of Na1/K1-ATPase pumps for much of their transport functions.e. Both b and d are correct.As the size of a cell decreases, the ratio of its surface area to volumea. increases.b. decreases.c. stays the same.Cell junctions called connect the cytoplasm of adjacent plant cells. a. plasmodesmata d. adhesion proteins b. adhering junctions e. chloroplasts c. tight junctions f. gap junctions
- Compared with a smaller cell, a larger cell of the sameshape has(A) less surface area.(B) less surface area per unit of volume.(C) the same surface-area-to-volume ratio.(D) a smaller cytoplasm-to-nucleus ratioThe difference between a gap junction and plasmodesmata is… Select one: a. Gap junctions are formed by microfilaments while plasmodesmata are formed by membrane b. Gap junctions are anchoring junctions while plasmodesmata are protein junctions. c. Gap junctions are formed by proteins making pores between two animal cells while plasmodesmata are formed due to incomplete cell division of membranes from adjoining plant cells.Which of these cell junctions are open channels that connect the cytoplasm of adjoining plant cells? A. Adhering junctions B. Tight junctions C. Gap junctions D. Plasmodesmata
