12.  The outer most boundary of   an animal cell is ___________.

   a.   the cell wall    b.  the cytoskeleton    c.   nuclear envelope    d.  the cell membrane

Animal cells lack a cell wall so the outer most boundary is the cell membrane (or plasma membrane as it is sometimes called).  The cytoskeleton is in the cytoplasm and the nuclear envelope encloses the nuclear material.

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Emma Erdahl, Associate Professor of Biology
Northern Virginia Community College
Revised 8/23/00