Pre-Class Review Questions Sec 10.2

What is the best characterization of the minus end of a dynamic filament? A. It lengthens more slowly than the plus end. B. It loses subunits quickly. C. It lengthens quickly but can also lose its subunits quickly. D. It lengthens more quickly than the plus end.

A. It lengthens more slowly than the plus end.

Intermediate filaments: A. have a diameter that is larger than a microfilament, but smaller than a microtubule. B. All of these choices are correct. C. undergo little change in length in comparison to microtubules and microfilaments. D. play an important role in preventing skin from tearing by shear stress. E. play an important role in maintaining cell shape.

B. All of these choices are correct.

Could melanin granules be moved by dynein and kinesin along an actin microfilament? A. Yes, motor proteins all use ATP to cause a conformation change. B. No, these motor proteins are specific to microtubules and cannot move along microfilaments. C. Yes, melanin granules would be moved by these motor proteins along microfilaments

B. No, these motor proteins are specific to microtubules and cannot move along microfilaments.

Motor proteins cause movement by: A. binding to the cytoskeleton. B. undergoing a conformational change C. All of these choices are correct. D. harnessing energy from ATP.

C. All of these choices are correct.

Which statement about intracellular transport is true? A. Kinesin and myosin move substances along microtubules. B. Kinesin moves substances along microfilaments. C. Kinesin and dynein move substances along microtubules. D. Kinesin and dynein move substances along microfilaments.

C. Kinesin and dynein move substances along microtubules.

Myosin is a motor protein that associates with: A. intermediate filaments. B. vimentin. C. microfilaments. D. microtubules.

C. microfilaments.

Dynamic instability is a: A. feature of microtubules and microfilaments. B. feature of microfilaments. C. feature of intermediate filaments. D. universal feature of the cytoskeleton. E. feature of microtubules.

E. feature of microtubules.