Chapter 6: Cytoskeleton

Question 1

Cytoskeleton

Answer 1

Network of fibers (small -> large: Microfilaments, Intermediate Filaments, Microtubules) that help to support the cell’s structure and interact with motor proteins to allow for CELL MOTILITY

Question 2

Microtubule

Answer 2

Thickest component of the cytoskeleton (25nm), shaped like hollow tubes and formed entirely of “tubulin” protein: Guides movement of vesicles, organelles, and the cell itself; Shapes the cell; Separates chromosomes in cell division

Question 3

Microfilament

Answer 3

Thinnest component of the cytoskeleton (7nm), formed of a double chain of actin. form the “Cortex” that supports (and can change) cell shape, contracts muscles, drives cytoplasmic streaming, aid in cell division.

Question 4

Intermediate Filament

Answer 4

Medium-diameter fiber of the cytoskeleton (8-12 nm) made of coiled keratin: support cell shape; hold organelles in place. More permanent than the other cytoskel. fibers.

Question 5

Motor protein

Answer 5

Can either move “cargo” across a cytoskeleton; remain in place while moving the cytoskeleton filament; bending cytoskeleton filaments