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Spindle fibers

a. direct chromosome movement in cell division

b.are composed of thin protein filaments

c. are made by the centrioles

d. all of the choices are correct


Sagot :

Spindle fibers .are composed of thin protein filament. Thus, the correct option is B. The spindle is made up of microtubules, which are strong fibers that make up the cell's "skeleton." Its duty during mitosis is to arrange and move the chromosomes around. As the centrosomes separate, the spindle grows between them.

When the spindle starts to form?

The mitotic spindle begins to collect and organize the chromosomes in late prophase (also known as prometaphase).

The cell will check to see if all of the chromosomes are at the metaphase plate, with their kinetochores appropriately connected to microtubules, before going to anaphase. This is known as the spindle checkpoint, and it ensures that when the sister chromatids separate in the next stage, they will split evenly across the two daughter cells. When a chromosome is misaligned or connected, the cell will stop dividing until the issue is resolved.

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