Which of the following is categorized as a non-membranous organelle?

Centrioles are categorized as non-membranous organelles because they are not enclosed by a membrane like other organelles such as the Golgi apparatus, lysosomes, and mitochondria. Non-membranous organelles are typically involved in various processes such as cell division, providing structural support, and facilitating biochemical reactions without the protective barrier of a lipid membrane.

In the case of centrioles, they play a critical role in cell division by organizing the spindle fibers that separate chromosomes during mitosis. Their structure consists of microtubules arranged in a specific pattern, which allows them to function effectively in this capacity. Understanding the distinction between membranous and non-membranous organelles is crucial in cellular biology, as it clarifies their functions and interactions within the cell.