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Cytoskeleton Tubulin 2 Quiz

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Questions and Answers

What is the composition of a microtubule?

Polymers of α-tubulin and β-tubulin (correct)

Polymers of desmin and lamin

Polymers of actin and tubulin

Polymers of keratin and tubulin

What gives microtubules their polarity?

The presence of desmin

The orientation of their subunits (correct)

The composition of α-tubulin and β-tubulin

The presence of lamin

How many parallel protofilaments compose a microtubule?

13 (correct)

What forms the helical microtubule lattice?

Slight stagger in the protofilament lateral contacts Signup and view all the answers

What is the process in which several tubulin molecules interact to form a microtubule seed?

Microtubule nucleation Signup and view all the answers

What is the change from growth to shrinkage of individual microtubules called?

Catastrophe Signup and view all the answers

What tends to force the protofilament into a curved shape that is less able to pack into the microtubule wall?

Hydrolysis of GTP after assembly Signup and view all the answers

Where are microtubules generally nucleated from?

Microtubule-organizing center (MTOC) Signup and view all the answers

What do Microtubule associated proteins (MAPs) like Map2 and Tau do?

Bind and stabilize microtubules Signup and view all the answers

What is the structure composed of two centrioles and surrounded by a dense mass of protein termed the pericentriolar material?

Centrosome Signup and view all the answers

What causes the end of a protofilament to grow in a linear conformation that assembles into the cylindrical wall of the microtubule?

Addition of GTP-tubulin to plus end Signup and view all the answers

What is the process in which individual microtubules alternate between cycles of growth and shrinkage called?

Dynamic instability Signup and view all the answers