3.5 Cytoskeleton Flashcards
What is a cytoskeleton?
An intricate network of protein “tracks” and tubules.
Why is the cytoskeleton necessary for cells?
It provides physical structure to maintain cell’s 3d shape
What type of system does a cytoskeleton have?
A transportation system
What does the cytoskeleton aid in?
Cell division and connecting cells together.
What are the three major components of cytoskeleton?
Microfilaments, intermediate filaments, and microtubules.
What is the thinnest component of cytoskeleton?
Microfilaments.
What are microfilaments made out of?
Protein actin
What are microfilament’s size in meters?
about 7 nanometers
What action relies on microfilaments and myosin?
Muscle contraction
What do intermediate filaments help do?
Maintaining the cell’s shape
What makes intermediate filaments different from other components compositionally?
Intermediate filaments are composed of a variety of proteins instead of only one
What are the sizes of intermediate filaments in meters?
About 10 nanometers
What is a microtubule and what is it made out of?
A component of the cytoskeleton. It is composed of subunits called “tubulin” assembled into a hollow tube.
What functions do microtubules have?
Form a “trackway” which specialized proteins “walk” along.
What are the sizes of microtubules in meters?
About 23 nanometers.
