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BIO188_Outline_Oct28

BIO188_Outline_Oct28 - BIO 188 BIO I have to end office...

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BIO 188 October 28, 2009 BIO 188 I have to end office hours early (2:45 pm) on Wed 10/28 Go through the animations on Blackboard Today: o questions about electron transport chain and oxidative phosphorylation o begin cell signaling and communication (Chpt. 15) means of communicating between cells intro to hormones importance and types of receptors What “signals” are we talking about? o Animals (& plants to some degree) detect and respond to environmental signals using senses external stimuli are converted from physical energy (light, touch, sound, etc) into chemical and electrical energy that’s not what we’re talkin’ about o Cell signaling and communication deals w/ communication between cells using chemical signaling molecules We can also pass a “signal” directly from one cell to another. How? Gap Junctions: Gap Junctions: An intercellular network of protein channels that facilitates the cell-to-cell passage of ions, hormones, and neurotransmitters. o proteins (called connexins) form a channel called connexon in plasma membrane o connexons of two adjacent cells join to form a channel between cells = gap junction o bridge between cytoplasm of two cells
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o channel too small for proteins, but direct transfer of ions, amino acids, ATP, and other signaling molecules Let’s start again: What “signals” are we talking about? Cells detect and respond to chemical signals in environment o may be from external environment or from neighboring cells Example of response to external chemical signal o single-celled slime mold shows chemotaxis : (video) o
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