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BIOB 260 Week 1 Notes

by: Isabella Sturgeon

BIOB 260 Week 1 Notes BIOB 260 - 00

Marketplace > University of Montana > BIOB 260 - 00 > BIOB 260 Week 1 Notes
Isabella Sturgeon
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Hi all! These are the lecture notes from BIOB 260 week 1. I have outlined and described the most important concepts about cellular energetics.
Cellular and Molecular Biology
Scott Samuels (P), Mark Lindsay Grimes
Class Notes
Biology, Cellular and Molecular Biology




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This 2 page Class Notes was uploaded by Isabella Sturgeon on Wednesday April 13, 2016. The Class Notes belongs to BIOB 260 - 00 at University of Montana taught by Scott Samuels (P), Mark Lindsay Grimes in Fall 2016. Since its upload, it has received 33 views.


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Date Created: 04/13/16
BIOB 260: Cellular and Molecular Biology Week 1 Cellular Energetics Important Concepts 1. How energetically unfavorable reactions proceed 2. Reaction coupling 3. Role of ATP/ other carrier molecules 4. Metabolic complexity of the cell Important concepts explained 1. Energetically unfavorable reactions Some reactions have a +∆G which makes them almost never occur unless they have another driving force. Try to imagine a large rock. It will fall down a hill easily, but the rock will never go back up the hill unless someone carries it or another external force pushes it back up. Energetically unfavorable reactions are just like this. They to get these reactions to go our cells use reaction coupling (explained in section 2). Some reactions that would normally proceed slowly are aided by enzymes which catalyze the reaction to make it go faster. 2. Reaction coupling Reaction coupling occurs when an energetically unfavorable reaction needs to proceed. The reaction most commonly coupled with an energetically unfavorable reaction is the hydrolysis of ATP, which is very energetically favorable. The large amount of free energy from that reaction couples with the energetically unfavorable reaction to reach the activation energy. 3. Carrier molecules The main purpose of activated carrier molecules, such as ATP is to store energy to be used to couple with other energetically unfavorable reactions. ATP is the main energy currency of the cell and the most common carrier molecule. a. How this works We must understand the structure of ATP. ATP is adenine bonded to a ribose and three phosphate groups. This molecule hydrolyzes and one phosphate group is removed yielding ADP. This phosphate is then useable for all sorts of reactions. ATP is used for many cellular processes like, glycolysis, cellular respiration, transportation of ions across membranes, movement, temperature increase and many more. b. Other carrier molecules NADH, NADPH, FADH2- all carry electrons and hydrogen, important for redox reactions Acetyl CoA- carries an acetyl group S-adensosylmethione- carries a methyl group Uridine diphosphate glucose- carries glucose ***** FOCUS MORE ON WHAT THE FUNCTION OF THE GROUP CARRIED***** 4. Metabolism Often times each reaction is part of a long chain of reactions that need each other to proceed. These chains of reactions are organized in metabolic pathways, where the product of one reaction is the substrate for another. a. Examples Photosynthesis and cellular respiration- photosynthesis releases O2 as a product which is then used for cellular respiration.


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