CK-12 Foundation
Ck 12: Biology: Cytoplasm and Cytoskeletons
[Free Registration/Login may be required to access all resource tools.] Discusses the roles of the cytoplasm and cytoskeleton.
BiologyWise
Biology Wise: Facts About Cytoplasm
Describes the composition of cytoplasm, its functions, the cell organelles suspended in it and what their functions are, and lots of other information about this vital cell component.