Bumblebees of the subgenus Psithyrus (known as 'cuckoo bumblebees', and formerly considered a separate genus) are brood parasites, sometimes called kleptoparasites, in the colonies of other bumblebees, and have lost the ability to collect pollen.
A eukaryotic cell is any cell with a true nucleus and organelles. The nucleus contains the majority of the cellâs DNA and is the genetic hub of the cell. Organelles are membrane bound structures found inside eukaryotic cells and they play a similar role to the organs of the body.Organelles perform certain roles to help the cell function more efficiently.he organelles and nucleus float in the cytoplasm of a cell. Ribosomes â produce proteins. Ribosomes are not true organelles because they are not enclosed in a membrane. Ribosomes can also be found in prokaryotic cells.
Eukaryotic cells are typically much larger than those of prokaryotes. They have a variety of internal membrane-bound structures, called organelles, and a cytoskeleton composed of microtubules, microfilaments, and intermediate filaments, which play an important role in defining the cell's organization and shape.he defining feature that sets eukaryotic cells apart from prokaryotic cells (Bacteria and Archaea) is that they have membrane-bound organelles, especially the nucleus, which contains the genetic material, and is enclosed by the nuclear envelope.