Final answer:
If asters are absent in a cell undergoing division, it indicates that Centrioles are also not present, as asters form around centrioles during cell division in animal cells.
Step-by-step explanation:
If a cell undergoing cell division lacks asters, another structure that would also be absent in this cell is Centrioles. Asters are star-shaped structures formed around the centrioles during cell division in animal cells. They help in organizing spindle fibres, which are necessary for proper chromosome alignment and separation. Since asters are associated with centrioles, if asters are not present, it implies that the cell does not have centrioles. Centrioles form the core of centrosomes and are responsible for nucleating spindle microtubules in animal cells. However, structures like spindle fibres, chromosomes, and microtubules can still be present even if centrioles are absent, such as in plant cells where the MTOC (MicroTubule Organizing Center) organizes the spindle apparatus without centrioles.