NEET BIOLOGY

Detailed explanation-1: -Definition. Centrioles are paired barrel-shaped organelles located in the cytoplasm of animal cells near the nuclear envelope . Centrioles play a role in organizing microtubules that serve as the cell’s skeletal system. They help determine the locations of the nucleus and other organelles within the cell.

Detailed explanation-2: -A centrosome is a cellular structure involved in the process of cell division. Before cell division, the centrosome duplicates and then, as division begins, the two centrosomes move to opposite ends of the cell.

Detailed explanation-3: -Centrioles are responsible for organizing the spindle fibers in the mitotic spindle apparatus and are thought to participate in the completion of cytokinesis during the process of cell division.

Detailed explanation-4: -(A) In animal cells, centrioles form the core structure of the centrosome, the main microtubule-organizing center. Quiescent cells (G0) or proliferating cells in the G1 phase of the cell cycle contain a single centrosome.

Detailed explanation-5: -Centrioles organize the microtubules to form spindle fibers that pull the chromosomes to the opposite ends for cytokinesis to occur. Centrioles are also modified to form the basal body of cilia and flagella.