The centrosome is best described as which of the following?

• A. The cell membrane
• B. Small round body in the cytoplasm
• C. Nucleus of the cell
• D. A lipid storage organelle

Answer: (B)

The centrosome is best described as a small round body in the cytoplasm because it serves as the cell’s microtubule organizing center, guiding the assembly of spindle fibers that separate chromosomes during cell division. It sits near the nucleus within the cytoplasm and, in many animal cells, contains a pair of centrioles, but its defining idea is that it organizes microtubules rather than forming part of the cell boundary, housing DNA, or storing lipids. The other structures—cell membrane, nucleus, and lipid storage organelles—have different primary roles, so labeling the centrosome as a small round cytoplasmic body most accurately captures its location and function.