Which of the following is not a characteristic of Kingdom Monera?

Kingdom Monera is composed of unicellular prokaryotic organisms, which lack a defined nucleus and other membrane-bound organelles. Therefore, multicellular is not a characteristic of Kingdom Monera.

Multicellularity is a feature of some other kingdoms, such as Kingdom Animalia and Kingdom Plantae, but not Kingdom Monera. It is important to note that the classification of organisms into kingdoms has evolved over time, and the Monera kingdom has since been split into the domains Archaea and Bacteria based on genetic and biochemical differences.