Question 9
What is the role of ATP in coupling the cell’s anabolic and catabolic processes? [Chapter 6]. And, how does chemiosmosis function in bioenergetics? [Chapters 9 and 10]
ATP powers cellular work by coupling
exergonic to endergonic reactions. (read pages 94-96)
ATP is an energy carrier or shuttle, and it can be recycled.
1. ATP releases a phosphate to become ADP
2. ADP releases a phosphate to become AMP
3. AMP gains a phosphate to become ADP
4. ADP gains a phosphate to become ATP
The principles of energy harvesting. (read 155-159)
1. Cellular respiration and fermentation are catabolic, energy yielding pathways.
2. Cells recycle the ATP they use for work.
3. Redox reactions release energy when electrons move closer to electronegative atoms.
4. Electrons “fall” from organic molecules to oxygen during cellular respiration.
5. The “fall” of electrons during respiration is stepwise, via NAD+ and an electron transport chain.
Chemiosmosis [pages 167-168, chapter 10]
1. Where does chemiosmosis occur in
a. Mitochondria?
b. Chloroplasts?
2. What elements are necessary for chemiosmosis to occur?
3. Chemiosmosis is the source of most ATP, substrate-level phosphorylation accounts for only a small amount of ATP.
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John C. Murphy |
Science |
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Phone: (815) 436-3200, ext. 2120 |
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jmurphy@learningcommunity202.org |
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