NEET BIOLOGY

Detailed explanation-1: -A kinetochore (/kɪˈnɛtəkɔːr/, /-ˈniːtəkɔːr/) is a disc-shaped protein structure associated with duplicated chromatids in eukaryotic cells where the spindle fibers attach during cell division to pull sister chromatids apart.

Detailed explanation-2: -Spindle fibers are the microtubules, centrosomes, and related structures that form during cell division, specifically in eukaryotic cells (those with a nucleus and membrane bound organelles).

Detailed explanation-3: -The movement of chromosomes is facilitated by a structure called the mitotic spindle, which consists of microtubules and associated proteins. Spindles extend from centrioles on each of the two sides (or poles) of the cell, attach to the chromosomes and align them, and pull the sister chromatids apart.

Detailed explanation-4: -Long protein fibers called microtubules extend from the centrioles in all possible directions, forming what is called a spindle. Some of the microtubules attach the poles to the chromosomes by connecting to protein complexes called kinetochores.

Detailed explanation-5: -These tubules, collectively known as the spindle, extend from structures called centrosomes-with one centrosome located at each of the opposite ends, or poles, of a cell.