The major components of the mitotic spindle include the spindle fibers (microtubules), microtubule-associated proteins, and the microtubule organizing center. The microtubules associated with mitosis are of three groups: the polar microtubules, the astral microtubules, and the kinetochore microtubules.
What are the 3 types of spindle microtubules?
The overall shape of the spindle is framed by three types of spindle microtubules: kinetochore microtubules (green), astral microtubules (blue), and interpolar microtubules (red). Microtubules are a polarized structure containing two distinct ends, the fast growing (plus) end and slow growing (minus) end.
How many types of spindle fibers are there?
So, the correct answer is ‘Nuclear spindle has three types of fibres’.
Is responsible for mitotic spindle and microtubule formation?
As the sole microtubule-organizing center (MTOC) in these cells that have a closed mitosis (the nuclear envelope stays intact throughout the cell cycle), the SPB must have access to the nucleoplasm to form the microtubules of the mitotic spindle and to the cytoplasm to form the astral microtubules that will position …