NEET BIOLOGY

Detailed explanation-1: -Centrosomes (1-17) Each of two centrosomes, the major microtubule organizing and nucleating centers in cells, consists of apair of centrioles (a mother centriole and a daughter centriole), surrounded by themicrotubule organizing center (MTOC).

Detailed explanation-2: -The centrosome is positioned in the cytoplasm outside the nucleus but often near to it. A single centriole is also to be found at the basal end of cilia and flagella. In this context it is called a ‘basal body’ and is connected with the growth and operation of the microtubules in a cilium or flagellum.

Detailed explanation-3: -A bound pair of centrioles, surrounded by a highly ordered mass of dense material, called the pericentriolar material (PCM), makes up a structure called a centrosome.

Detailed explanation-4: -Within the cell, a centrosome is a structure that organizes microtubules during cell division. Each centrosome contains “paired barrel-shaped organelles” called centrioles and a “cloud” of proteins referred to as the pericentriolar material, or PCM.

Detailed explanation-5: -The centrosome is located in the cytoplasm usually close to the nucleus. It consists of two centrioles-oriented at right angles to each other-embedded in a mass of amorphous material containing more than 100 different proteins.It is duplicated during S phase of the cell cycle.