Final answer:
Plasmacytes lack centrosomes but can have vacuoles containing immunoglobulins, correlating with their function in the immune response.
Step-by-step explanation:
Plasmacytes, or plasma cells, are a type of white blood cell that secrete antibodies. These cells do not contain centrosomes, which are found in many animal cells but not in mature plasmacytes. However, plasmacytes sometimes have vacuoles that may contain immunoglobulins or other substances related to their role in immune response. Vacuoles can be involved in storing and transport within cells, and in plant cells, they are also involved in the breakdown of macromolecules.