Final answer:
The major microtubule-organizing center in most animal cells is the centrosome, containing a pair of centrioles that organize the microtubule network.
Step-by-step explanation:
The major microtubule-organizing center in most animal cells is the centrosome.
Animal cells contain a structure known as the centrosome, which serves as the primary microtubule-organizing center. The centrosome is positioned near the nucleus and is essential in organizing the microtubules that are crucial to various cellular activities, including maintaining the cell's structure and facilitating cell division. Each centrosome houses a pair of centrioles, which are oriented perpendicular to one another. These centrioles are made up of nine triplets of microtubules, serving as a foundation for the microtubule network that extends throughout the cell.
The major microtubule-organizing center in most animal cells is the centrosome. The centrosome contains a pair of centrioles, which are structures that lie perpendicular to each other. Each centriole is composed of nine triplets of microtubules.