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Questions tagged [cytoskeleton]

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1answer
215 views

Plasma Membrane Proteins and Cytoskeletal Attachment

Regarding membrane protein functions, which of the following statements is CORRECT? a. Membrane proteins are responsible for both cell to cell recognition and cell anchoring and are ...
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0answers
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How exactly do microfillaments change the cell membrane's shape?

I understand that they are concentrated under cell membrane and can contract, but the details aren't very clear. How do they attach to membrane, and in what direction do they pull? Do they draw two ...
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1answer
52 views

Building microtubules [closed]

I have some questions regarding building microtubules: Do alpha and beta monomers always exist as dimers when they are bonding to form tubulin? When tubulin structure is destroyed, do alpha and beta ...
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1answer
159 views

Why eukaryotes have three different types of cytoskeleton filaments?

Ok: IF, microtubules and microfilaments serve different purposes. But whats the biological advantage of having these three types over other organisms? I don't know if I'm being clear.
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1answer
86 views

Etymology of vimentin [closed]

What is the etymology of the intermediate filament , Vimentin?
3
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2answers
449 views

Cytoskeleton made of only actin?

I am aware that the cytoskeleton has three structural components: actin, microtubules and intermediate filaments. I was wondering if any cell could possess a cytoskeleton made only of actin. Or made ...
3
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1answer
763 views

COPI/COPII proteins and kinesins/dyneins

I am considering the transport of protein from ER to Golgi, and have read that this involves the COPII protein coat. I have also read that this is a form of anterograde transport, and elsewhere that ...
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0answers
154 views

Retrograde/anterorade transport; kinesin/dynein; COP1/COP2; Endoplasmic reticulum/Golgi

I am getting slightly confused with all of the terms above and was wondering if someone could see if I have got this right: I think transport from the ER to Golgi is almost always from the plus end ...
0
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1answer
476 views

What is a centrosome?

I know that a centrosme is composed of two perpendicular centrioles, but the following sentences of Wikipedia confuse me: Interestingly, centrioles are not required for the progression of mitosis. ...
0
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1answer
59 views

Role of Intermediate Filaments in cell - cell signalling

A passage in my textbook mentions briefly that the role of intermediate filaments in the cytoskeleton is to enable cell to cell signalling by extending between special junctions and alowing cells to ...
2
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2answers
1k views

Why do sperm have centrioles and do female eggs cells even have centrioles?

I was just wondering why it is that sperm have centrioles underneath the acrosome, but that also prompted a thought as to whether eggs have them too?
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3answers
971 views

At which end does polymerization of microtubules occur?

My book says that polymerization and depolumerization of microtubules occurs on the + end however, I've found a note that says that depolymerization occurs on the - end. I need help please :) thank ...
10
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1answer
4k views

How is centriole number maintained during meiosis?

I've found a website (Pearson's BioCoach) that claims centrioles duplicate in Prophase II. Is this accurate? Does it depend on the species in question? Looking at three textbook illustrations of ...
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1answer
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How do the homologous chromosomes pair up and position themselves along the center of the cell? [closed]

I am not sure... Most textbooks just state "they line up" but I don't know how... Something to do with the cytoskeleton or microtubules? Thanks for any help
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2answers
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Cytochalasin B in cell movement

In an experiment by Pollard, T.D. and R.R. Weihing, amoeba cells injected with Cytochalasin B were inhibited of movement, while the control group amoeba cells did move. A hypothesis was made that ...
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2answers
805 views

Breakdown of energy expenditure at the level of a single cell

The metabolic rate measures how much energy an organism expends over a unit of time. Its breakdown for the human body in terms of its functions is well documented : so much for the heart, for the ...
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1answer
722 views

Why can't intermediate filaments be used as tracks by motor proteins?

A motor protein like kinesin-1 cannot use an IF as a track because it lacks polarity. Can someone elaborate on this answer?
4
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1answer
62 views

What are the effect of microtubule or microfilament inhibition on yeast expression profile?

I was wondering whether anyone has looked at what are the expression changes in yeast when the microtubule or the microfilament polymerization is inhibited? Have there been whole-genome studies?