Cytoskeleton

GTP

GTP

________ must be bound to both α and β subunits for a tubulin heterodimer to associate with other heterodimers to form a protofilament.

Microtubule

________: a stiff hollow cylinder about 24 nm in diameter.

Subunits

________ are recruited at the plus end and shed from the minus end at an identical rate.

Microfilaments

________: solid rods about 7 nm in diameter, built as a twisted double chain of actin subunits.

eukaryotic cytoskeleton

The ________: a network of filaments and tubules that extends from the nucleus to the plasma membrane.

Bundles of microfilaments

________ make up the core of microvilli of intestinal cells.