Linder Keratins

Question 1

What are the three main filamentous polymer proteins that make up the cytoskeleton?

Answer 1

microfilaments, intermediate filaments, and microtubules

Question 2

Microfilaments are composed of what proteins?

Answer 2

actin

Question 3

Microtubules are composed of what proteins?

Answer 3

tubulin

Question 4

T/F: Actin microfilament formation is an energy dependent process.

Answer 4

True – actin microfilaments are also polarized

Question 5

What family of motor proteins move cellular cargo along actin microfilaments?

Answer 5

myosin

Question 6

What family of motor proteins move cellular cargo along microtubules?

Answer 6

dynein and kinesin

Question 7

T/F: Intermediate filament formation is an energy dependent process.

Answer 7

False – form spontaneously

Question 8

How are intermediate filaments different from microfilaments and microtubules?

Answer 8

not polarized, do not use energy to form, do not function with motor proteins

Question 9

What is the function of intermediate filaments?

Answer 9

anchors organelles, resists tensile force; they are flexible, elastic and tough; can reform after distortion (structural resiliency)

Question 10

What are Type I keratins?

Answer 10

acidic keratins

Question 11

What are Type II keratins?

Answer 11

basic-neutral kerains