According to the text, the core of cilia and flagella (axoneme) possesses a number of microtubules . Centrioles are made up of peripheral fibrils of tubulin protein (which form microtubules) , and they form the basal body of cilia or flagella, as well as spindle fibres that give rise to the spindle apparatus during cell division . Chromatin and nucleosomes are composed of DNA and histone proteins , not microtubules.