The Virtual Cell Biology Classroom provides a wide range of free educational resources including Power Point Lectures, Study Guides, Review Questions and Practice Test Questions.
Cilia & Flagella: These extensions of the cell are covered with plasma membrane and supported internally with a structural system of microtubules—kind of like a bone covered in skin. Flagella, which are longer, and cilia, which are shorter, aid in cell movement. Cilia, which are able to beat together in a coordinated manner, can also help direct materials around the outside of the cell.
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Eukaryotic Cell Envelope & External Structures
Cell Wall: The cells of plants, algae and fungi have thick, protective cell walls, which provide support, help maintain the shape of the cell, and prevent the cell from taking in too much fresh water and bursting.
Plasma Membrane: All cells, both prokaryotic and eukaryotic, have a plasma membrane, made mainly of phospholipids and proteins, which functions as a barrier, regulating the movement of materials between the inside and the outside of the cell.
Illustration of a generic eukaryotic animal cell. Click herefor a practice assignment on identifying the parts of an animal cell.