Agenda 11/5 1) Grade free response questions 2) Pass back test corrections and photosynthesis quizzes 3) Review for test using Big Idea Powerpoint 4) Check out more review manuals – can stay at home, have class set – will send some to Career Center and Library 5) Per. 6 inquiry Homework Study for test tomorrow – focus on enzymes, cell respiration, and photosynthesis (esp. lab concepts) but anything from 6-10 and prior tests is fair game. Math questions are calculate mean, rates, and energy coupling Note - Website updated with most recent Powerpoints
28
Embed
Agenda 11/5 1) Grade free response questions 2) Pass back test corrections and photosynthesis quizzes 3) Review for test using Big Idea Powerpoint 4) Check.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Agenda 11/5
1) Grade free response questions 2) Pass back test corrections and photosynthesis quizzes3) Review for test using Big Idea Powerpoint4) Check out more review manuals – can stay at home,
have class set – will send some to Career Center and Library
5) Per. 6 inquiry
Homework Study for test tomorrow – focus on enzymes, cell
respiration, and photosynthesis (esp. lab concepts) but anything from 6-10 and prior tests is fair game.
Math questions are calculate mean, rates, and energy coupling
Note - Website updated with most recent Powerpoints
Agenda 11/6
Cells and Metabolism Unit Test- Good Luck!!!Check gradeTurn in test corrections
Homework – Chapter 11 Notes and concept checks due Friday, Ch. 12
due next Tuesday
Agenda 11/7
1) Standard Deviation calculations2) Cell signaling animations from online assignments
Homework – Chapter 11 Notes and concept checks (NOT 11.5) and
online assignments due FridayCh. 12 Notes and concept checks due next Tuesday Ch. 12 Online assignments due next WednesdayNOTE – MAKEUP TESTS WILL BE DURING CLASS
TOMORROW
Agenda 11/8
Finish cell signaling – put it all together
Homework –
Chapter 11 Notes and concept checks (NOT 11.5) and online assignments due tomorrow
Ch. 12 Notes and concept checks due next Tuesday
Ch. 12 Online assignments due next Wednesday
Cell signaling and Evolution
In yeast and bacteria, cell signaling is very similar to multicellular organisms
Yeast use it to find each other for sex Bacteria use it to aggregate as spores in
times of low nutrients
Cell signaling has remained important in the microbial world. Myxobacteria, soil-dwelling bacteria, use chemical
signals to communicate nutrient availability. When food is scarce, cells secrete a signal to
other cells leading them to aggregate and form thick-walled spores.
Yesterday, we saw the different types of receptors - what were they? G protein-linked, tyrosine kinase, ligand-
gated ion channel, and intracellular
A G-protein-linked receptor consists of a receptor protein associated with a G-protein on the cytoplasmic side. The receptor consists of seven alpha helices
spanning the membrane. Effective signal
molecules include yeast mating factors, epinephrine, other hormones, and neurotransmitters.
Second messengers (small, non-protein signal molecules that diffuse) – what were the 2 we saw yesterday? cAMP and Calcium ions (usually Ca++ low in cell)
Certain microbes cause disease by disrupting the G-protein signaling pathways. The cholera bacterium, Vibrio cholerae, colonizes
the small intestine and produces a toxin that modifies a G protein that regulates salt and water secretion.
The modified G protein is stuck in its active form, continuously stimulating productions of cAMP.
This causes the intestinal cells to secrete large amounts of water and salts into the intestines, leading to profuse diarrhea and death if untreated.
Rather than relying on diffusion of large relay molecules like proteins, many signal pathways are linked together physically by scaffolding proteins. Scaffolding proteins may themselves be relay
proteins to which several other relay proteins attach.
This hardwiring enhances the speed and accuracy of signal transfer between cells.