16.In multicellular organisms some cells need to be large because of the functions they perform (i.e. nerve cells, muscle cells). What shape would be most desirable for these larger cells? A LONG, CYLINDRICAL SHAPE.
Cell Size 17. Propose, by means of a sketch, geometrical shapes of cells that would allow a balance of function and materials movement for each of the following situations. ( Hint: Think about which aspect of shape would help the cell best carry out its given function.) a. Long-distance communication. LONG, THIN CYLINDERS (LARGE SURFACE AREA WITH SMALL DIAMETER) *nerve cells b. Stretching. LONG, THIN CYLINDERS (LARGE SURFACE AREA WITH SMALL DIAMETER) *muscle cells c. Storage. SPHERICAL, FOR MAXIMUM VOLUME *vacuoles, vesicles d. Covering and protecting. SHEET-LIKE SHAPE WITH LARGE SURFACE AREA *skin cells (epithelium—think of those thin, thin cheek cells that occur in layers…) e. Importing large quantities of material for transfer to other cells. ANY OF THE SMALL, SYMMETRICAL SHAPES FOR MAXIMUM SURFACE AREA TO VOLUME RATIO 18. Among unicellular eukaryotes, cell sizes differ greatly. Amoeba and Paramecium organisms are animal-like protists that are heterotrophic, have no cell wall, and are several times larger than most human cells. What might be some reasons why these unicellular organisms have larger cells than cells with similar traits (heterotrophic, lacking cell walls) that are found in multicellular organisms? THESE UNICELLULAR ORGANISMS ARE NOT SPECIALIZED, BUT HAVE TO CARRY OUT ALL SURVIVAL FUNCTIONS—OBTAINING FOOD, REPRODUCING, MOVEMENT, DEFENSE, ETC.
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