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.
Core organelles are found in virtually all eukaryotic cells. They carry out essential functions that are necessary for the survival of cells â harvesting energy, making new proteins, getting rid of waste and so on. Core organelles include the nucleus5, mitochondria6, endoplasmic reticulum and several others.