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Biochemistry 431 > Photosynthesis > Flashcards

Flashcards in Photosynthesis Deck (14)

Do plants have a mitochondrial ETC?



What kind of redox scheme does the ETC have? PSN?

ETC linear redox scheme; PSN has a z-scheme in which light energy is used twice (p680, p700) to excite chlorophyll


What are the electron carrying co-factors for the mitochondrial ETC?

NADH, FADH2, Fe-s, Cu, ubiquinone, cytochromes,


What are the electron carrying co-factors forphotosynthesis?

NADPH, Fe-S, Cu (plastocyanin), Plasto-quinone, cytochromes


To which lipid class do chlorophylls, carotenoids, and xanthophylls belong to?

isoprenoid derived


What is the difference between the proton pumps in animals and plants?

Both have F1 and F0 components; orientation the same; land plants have bigger F1 components 14 vs 10, and need more protons to make ATP; the orientation of the H+ gradient with respect to the membrane is different.


What is the role of superoxide dismutase?

Superoxide dismutase reacts with ROS' and forms hydrogen peroxide.


What compound is incredibly important in neutralizing ROS'?

glutathione, especially in the mitochondria/ the photosynthetic ETC has a diverse group of antioxidants (


ETC Vs. PSN (Starting point)

1) Starts with NADH, ends with turning O2 into H20 2) Starts by taking electrons from H20 making O2


Strongest redox carriers ETC vs. PSN

ETC- NADH and O2; PSN - Chlorophyll


Energy stored primarily as... ETC vs PSN

Delta psi vs delta pH


ROS mechanisms ETC vs PSN

glutathione vs. has many diverse groups of antioxidants


Which method of ATP production, ETC vs. PSN, produces more ATP?

ETC = 5 ATP/ PSN = 3 ATP


What is the orientation of the H+ gradient with respect to the membrane? (ETC vs. PSN)

The orientation of the H+ gradients are opposite with respect to the membrane.

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