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The nucleus is filled with protons and neutrons, usually depicted as spheres. you are thinking of a nucleus in an atom (chemistry). in biology, the rod-shaped structures inside the nucleus is the chromosome, the genetic material of the cell.hey are rod shaped bodies that lie at right angles to each other; internally they are made up of fine microtubules. â¦ Centrioles are best known for their role in generating microtubules, and during cell division, the centrioles diret the formation of the mitotic spindle. 2 people found this useful.
The nucleus of an atom is its central body, holding particles called protons and neutrons. The number of protons in the nucleus is the atomic number of the element; for example, a helium atom always has two protons, and carbon always has six. Different numbers of neutrons for the same element make atomic cousins called isotopes.