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.
9.18 a,bâ¢ First discovered in 1963 associated with cilia & flagellaâ¢ Cytosolic form purified ~ 1983.â¢ Ubiquitous in eukaryotic cells.â¢ Structure: 1.5 million daltons 2 heavy chains, other smaller chainsâ¢ Travels in-direction on MTâ¢ Requires dynactin to bind to cargoMotor Protein/MT modelFig.