Skip to main content
11 votes
Accepted

Why are microtubules absent in and around the nucleus?

tl;dr Cells are 3D and the cytoskeleton does not exist within the nucleus. There are several things you have to be aware of when looking at such pictures. Remember, you are looking at a 3D object ...
S Pr's user avatar
  • 6,272
3 votes
Accepted

What is intracellular retention?

Based on this line from the paper you linked, it seems like they are using intracellular retention to refer to proto-cadherins being taken up in to the cell via endocytosis. It is possible that the ...
Brad0440's user avatar
  • 721
3 votes

Why eukaryotes have three different types of cytoskeleton filaments?

While eukaryotes contain tubulin-containing microtubles and actin filaments, prokaryotic homologues do exist. For example FitZ protein, the most common bacterial Tubulin homologue[1], is involved in ...
Keron's user avatar
  • 41
3 votes
Accepted

Etymology of vimentin

According to this paper: From the Latin word vimentum, used to describe arrays of flexible rods,both ordered ones (e.g.,latices,filigres,and wicker-work) and non-ordered ones (e.g.,brushwood). ...
JM97's user avatar
  • 4,836
2 votes
Accepted

COPI/COPII proteins and kinesins/dyneins

Interesting question. The term anterograde refers to movement in the forward direction. In the context of vesicular trafficking, anterograde refers to (1) movement from the site of protein synthesis ...
canadianer's user avatar
  • 17.8k
2 votes
Accepted

Absence of cytoplasmic Intermediate Filaments in Arthropods

It is stated that out of all eumetazoans in Kingdom Animalia, only arthropods do not contain such structures. I found this paper(1), eliciting an exception (within an exception)- Isotomurus maculatus:...
Bipasha's user avatar
  • 964
2 votes
Accepted

What is role of centriole in the formation of microtubule during cell divison?

What is the function of centrioles( two barrel-shaped structure perpendicular to each other) in the formation of microtubules? Let's clear your basics first, Centrioles have no function in the ...
biologist_Jaishree's user avatar
1 vote

Does cytoplasmic streaming cause passive organelle movement in animal or fungi cells?

If you look at http://en.wikipedia.org/wiki/Melanosome you will see an example of this organelle being transported in animal cells. Is this what you mean? or are you looking for unbound organelles ...
Polypipe Wrangler's user avatar
1 vote
Accepted

Does cytoplasmic streaming cause passive organelle movement in animal or fungi cells?

I believe that fungi use cytoplasmic streaming to transport organelles to the tips of their hyphae to extend them. I haven't heard of cytoplasmic streaming in animal cells but it might exist.
selenocysteine's user avatar
1 vote

Why are microtubules absent in and around the nucleus?

@MasterOfGalaxy one of the roles of the microtubule cytoskeleton is the mechanical support of the cell. The nucleus has its own specific skeleton. The nuclear lamina is a proteinaceous meshwork ...
Arash Salehi's user avatar
1 vote

Why doesn't G-actin concentration fall once microfilament polymerization begins?

The critical concentration is better defined as the "equilibrium concentration of the pool of unassembled subunits"1. An analogy that might be helpful is thinking about a NaCl (table salt) solution — ...
tyersome's user avatar
  • 5,598
1 vote

Plasma Membrane Proteins and Cytoskeletal Attachment

a. Membrane proteins are responsible for both cell to cell recognition and cell anchoring and are stabilised by linking through to the microtubulele cytoskeletal fibres. Not entirely correct as you ...
WYSIWYG's user avatar
  • 35.6k
1 vote
Accepted

Building microtubules

Microtubules polymerise from and depolymerise into alpha-beta-tubulin dimers. Both happen on both ends, see this question: At which end does polymerization of microtubules occur?.
Armatus's user avatar
  • 7,670
1 vote

Cytoskeleton made of only actin?

1) Can cells survive without any of the different cytoskeletal components? Yes, most certainly. At least for actin and microtubules (MTs) there are plenty of eukaryotic cell types that can survive ...
Armatus's user avatar
  • 7,670
1 vote
Accepted

What is a centrosome?

Reading the specified Wikipedia article about Centrosome, actually explains why centrioles are NOT IMPORTANT for the PROGRESSION OF MITOSIS. To better understand what wiki meant, let us look at both ...
Imtiaz Raqib's user avatar
  • 1,278
1 vote
Accepted

Role of Intermediate Filaments in cell - cell signalling

There are desmosomes and gap junctions (cell-cell-contact), and hemidesmosomes (cell-basal membrane-contact) which enable a stable united cell structure. I'm not so aware with this topic, but I found ...
SeRe's user avatar
  • 425

Only top scored, non community-wiki answers of a minimum length are eligible