BIO230H1 Lecture Notes - Lecture 19: Acetylcholine, Cell Signaling, Cell Membrane

• School: UTSG
• Department: Biology
• Course: BIO230H1
• Professor: Darrell Desveaux Tony Harris

Document Summary

Cellular signaling: cells must communicate to develop and maintain multicellular organisms, unicellular bacteria-like organisms existed on earth for approx. 2. 5 billion years before complex multicellular organisms arose. In part, this delay may have been due to the time needed to evolve complex signaling systems: however, unicellular organisms do communicate . Individual yeast cells signal between each other to attract. Send out extensions, allowing them to mate with one another by forming contacts to exchange genetic material. How do cells communicate to develop and maintain complex multicellular organisms: mammals, flies, and worms use similar communication pathways, many core pathway components were first discovered in mutants, affecting cell communication in drosophila, c. elegans, and yeast. It"s easier to make discoveries with organisms like flies, yeast, and c. elegans. Signaling pathways identified are highly conserved, and are the same or very similar in humans.