1 Centrioles occur as paired cylindrical organelles together with pericentriolar material (PCM) in the centrosome of an animal cell. 2  Centrioles are found as single structures in cilia and flagella in animal cells and some lower plant cells. 3  Centrioles are constructed of microtubules.entrioles are absent from the cells of higher plants. When animal cells undergo mitosis they are considered by some to benefit from the presence of centrioles which appear to control spindle fibre formation and which later has an effect on chromosome separation.