Linder Keratins Flashcards Preview

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Flashcards in Linder Keratins Deck (11)
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1
Q

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

A

microfilaments, intermediate filaments, and microtubules

2
Q

Microfilaments are composed of what proteins?

A

actin

3
Q

Microtubules are composed of what proteins?

A

tubulin

4
Q

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

A

True – actin microfilaments are also polarized

5
Q

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

A

myosin

6
Q

What family of motor proteins move cellular cargo along microtubules?

A

dynein and kinesin

7
Q

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

A

False – form spontaneously

8
Q

How are intermediate filaments different from microfilaments and microtubules?

A

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

9
Q

What is the function of intermediate filaments?

A

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

10
Q

What are Type I keratins?

A

acidic keratins

11
Q

What are Type II keratins?

A

basic-neutral kerains