Royal jelly, a thick, milky substance secreted by young nurse honeybees to feed a bee colonyâs larvae, most notably the queen larvae, is a rich source of nutrients, as well as acetycholine, a neurotransmitter that plays a critical role in cognitive function.
The origin of the eukaryotic cell is a milestone in the evolution of life, since eukaryotes include all complex cells and almost all multicellular organisms. The timing of this series of events is hard to determine; Knoll (2006) suggests they developed approximately 1.6â2.1 billion years ago.
There are two main classes of cells, namely: (A) Prokaryotic cell. (B) Eukaryotic cell. The terms prokaryotic and eukaryotic were suggested by Hans Ris in the 1960âs. The prokaryotes consists of the bacteria and blue green algae and were first to arise in biological evolution (i.e., about 3 x 10 9 years old). The eukaryotic cells are found in all multicellular animals, plants and fungi.