10.21.05 - October 21, 2005 cell signaling and responses to...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
October 21, 2005 A History E.coli (prokaryote) o E.coli exhibit chemotaxis in response to simple sugars or amino acids o E.coli have flagella which can cause the cell to run or tumble o Which one they do is determined by the chemical stimulant o When there are no sugars or AAs, they tumble. Once one land on their receptor, they run to the source. Paramecium (eukaryote) o When it bounces into an object, it backs off and goes the other way o Caused by depolarization Cell-cell communication o Mating types in yeast: “a” and “ α o When either detects the other’s pheromone, they fuse together o Receptor is on the membrane o Must bind with signal, and when this happens, starts some change o In multicellular organisms: Local Signaling (e.g. pacranine, where secretions of one cell change growth or development of target cells. Another example is nerve synapses, where neurotransmitters are released by nerve terminal, causing muscle contractions, etc. Long Distance Signaling
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 3

10.21.05 - October 21, 2005 cell signaling and responses to...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online