bioenergetics lecture 5 summary [email protected] last time –integrating catabolic...
TRANSCRIPT
![Page 1: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/1.jpg)
Bioenergetics Lecture 5 summary• [email protected]• Last time –integrating catabolic
metabolism, review catabolism• This time
– similarities and differences between cellular respiration and photosynthesis
– chlorophyll, photosystems II and I (in that order)
• But first….!
![Page 2: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/2.jpg)
Electron transport chain pumps H+, making a gradient
Fo in inner
mem
brane
F1 in
matrixLower H+ concentration = higher pH
Mitochondrial matrix
Higher H+ concentration = lower pH
Intermembrane space
ATP synthase uses the H+ gradient to generate ATP
Potential energy of falling waterused to grind grain
Potential energy of ‘falling’ H+ used to generate ATP
![Page 3: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/3.jpg)
ATP synthase uses the H+ gradient to generate ATP
![Page 4: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/4.jpg)
Cellular Respiration
![Page 5: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/5.jpg)
A series of redox reactions ….
PHOTOSYNTHESIS
RESPIRATION
RESPIRATION
PHOTOSYNTHESIS
![Page 6: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/6.jpg)
Respiration vs photosynthesis
• Mitochondria– All aerobic eukaryotes
• Oxidation of CHO to CO2
• Generation of NADH and FADH2
ATP synthesis
• Chloroplasts– Plants, algae
• Energy harvest from sunlight• Generation of NADPH
Reduction of CO2 to CHO
Note NADH (respiration) vs NADPH (photosynthesis)P photosynthesis
CHO = carbohydrate
![Page 7: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/7.jpg)
![Page 8: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/8.jpg)
Photosynthesis is an endothermic redox process
Energy source?
Useful byproducts? Sunlight
Glucose and O2
![Page 9: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/9.jpg)
Red and Bluelight are absorbed from the incident (white) light, leaving Green to be reflected or transmitted
![Page 10: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/10.jpg)
Photosynthesis produces oxygen
Are all wavelengths photosynthetically active?
Spirogyra
PhotosyntheticActive spectrum
![Page 11: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/11.jpg)
First, light energy must be captured
Illuminated chlorophyll fluoresces (gives off light) if captured light energy is not transferred to another acceptor
![Page 12: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/12.jpg)
Capture is not enough!
Isolated chlorophyll fluoresces if newly captured energy is not transferred
In a leaf, the reaction centre transfers the captured energy to a relatively stable intermediate chemical
![Page 13: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/13.jpg)
The reaction centre is the heart of the photosystem
Energy transfer between pigment molecules to a special central pair of chlorophylls (reaction centre) and thence to the primary electron acceptors
![Page 14: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/14.jpg)
Two parts to the light reaction
![Page 15: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/15.jpg)
Chemiosmosis can make ATP
![Page 16: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/16.jpg)
![Page 17: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/17.jpg)
Two parts to the light reactionphaeophytin
ferredoxin
![Page 18: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/18.jpg)
Source and fate of carbon and oxygen in carbohydrates formed by photosynthesis
![Page 19: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/19.jpg)
Photosystem II makes ATP
![Page 20: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/20.jpg)
Photosystem I makes NADPH
![Page 21: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/21.jpg)
NADH vs NADPH
• NADH catabolism
• NADPH anabolism
(P photosynthesis)
• For each, the reduced form stores ~ 3 times more energy than ATP
![Page 22: Bioenergetics Lecture 5 summary Susan.Kaminskyj@usask.ca Last time –integrating catabolic metabolism, review catabolism This time –similarities and differences](https://reader030.vdocuments.us/reader030/viewer/2022032702/56649ca45503460f9496513a/html5/thumbnails/22.jpg)