Microtubule section 3 Flashcards Preview

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Flashcards in Microtubule section 3 Deck (12):
1

Base structure of a cytoplasmic dynein?

Tail consists of light chains and intermediate chains.
Heavy chains spread through the whole molecule. The ATPase activity is right before the stock. which has the microtubule binding point.

2

Arp1 filament is made of an actin and mediates _____

the motor proteins binding to the vesicle

3

What do motor proteins use as their energy source?

ATP hydrolyses.

4

Which microtubule is complete in a centriole, A or B?

A.
A is also complete for the centriole.

5

What shape does flagella locomotion take?

It is a sinusoidal wave.

6

What shape is cilia movement?

Cilia movement has a power stroke, where the cilium is completely straight followed by a recovery stroke were the cilium is bent and kind of drifts back.

7

How do microtubules slide past each other?

the tail regions of the motor proteins link, allowing one to pass by the others.

8

How is bending achieved during flagella and cilial movement instead of the proteins sliding past each other?

This is accomplished because the proteins have linking proteins (most likely nexins)

9

The positive ends of microtubules in AXONS are always pointed away or towards the axonal synapse?

They are always pointed towards the axonal synaptic end.

10

The positive ends of microtubules in DENDRITES are always pointed away or towards the axonal synapse?

BOTH!!! Microtubules point both ways in the dendrite.

11

Dynein travels...
Kinesin travels...

Dynein travels... towards the negative end
Kinesin travels... towards teh positive end

12

Dynein travels...
Kinesin travels...

Dynein travels... towards the negative end
Kinesin travels... towards the positive end