Microfilaments in Cell Division?

[ipodtouch]

I'm reading the Kaplan book and it has no mention in it about Microfilament's role in Cell Division.

From what I remember, they pull apart the chromosome pairs and also Pull the Cell in for Cytokinesis.
Is this correct?



I encountered this problem:

What is the role of microfilaments in cell division?
A. They separate the sister chromatids.
B. They push the cell into anaphase.
C. They replicate the DNA during S phase.
D. They split the cell during cytokinesis.

And I'm having a difficult time knowing why D is incorrect.

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[MT Headed]

"Myosin II uses the free energy released when ATP is hydrolysed to move along these actin filaments, constricting the cell membrane to form a cleavage furrow." via http://en.wikipedia.org/wiki/Cytokinesis#Contractile_ring_positioning

I agree, answer D is quite compelling.

 

[ipodtouch]

The question is not from the MCAT, so I assume that it is of poor design.


But thanks for the reassurance!

 

[SaintJude]

What to they say the answer is? Perhaps they are confusing microtubules with microfilaments.

A. Spindle fibers, which consist of microtubules, are responsible for the separation of sister chromatids during anaphase.
B. Cyclins regulate the progression of the cell cycle
C. DNA polymerase replicates DNA
D. Yeah, when actin filaments contract, the cleavage furrow forms during cytokinesis.

 

[ipodtouch]

They said it was A

but yeah, again it's probably a poor question

 

[milski]

Sister chromatids are separated by (kinetochore) microtubules. Can't quote it in a single sentence but there are a few very clear pictures of that in my bio textbook.

 

[MT Headed]

So the answer is A, but the question is wrong. Lol

 

[pfaction]

? I thought the MTOC and kinetochores (made of microtubules) separate chromatids? I thought microfilaments = ameboid and anaphase/telophase.

 

[MedPR]

I guess Kaplan test writers confused microtubules and microfilaments?

 

[SaintJude]

I don't think this question is from Kaplan.