Photosynthesis, Light Reactions Flashcards
What is the Planck-Einstein relation equation?
What it’s Plancks constant? What units are they in?
What is the overview light reaction and carbon reaction?
What are the three sets of membranes that make up the chloroplast?
Where do all light reactions take place, and absorption of light (might have other places it absorbs idk)?
Where do the biosynthetic carbon reactions take place?
What is analogous to mitochondrial matrix? What’s the “inner membrane space”?
Explain how plants ETC works relative to how it works in humans.
What are the two soluble electron carriers in plants?
How many complex’s does it have?
How does the first complex work(PS2)?
How does PS1 work? (Complex 3)
Q cycle and PC (cytochrome c analogous).
3
Breaks down water (exact opposite of humans)
Excited again (energy goes up not down!)
What is P680 referring to?
The pair is always between D1 and D2!
Why are there so many pigment molecules?
When reasounce reaches special pair, electron locked in. Excites electron on pair and wants it to leave, Pheophytin A gets it. Qa (tightly bound to PS2) moves electron to Qb to Cytochrome b6f.
Causes water splitting!
What is biology’s strongest oxidizing agent?
+ means lost electron!
Z = tyrosine (now super strong oxidizer from P680+) works with OEC nearby to break water!
1 electron at a time! Takes 4 rotations of this to make water.
If Delta E = E°’ acceptor - Eº’ donar is > 0 what does this mean for delta G?
Reaction is spontaneous as it means delta G is less than 0
What does the more positive Eº mean?
The higher affinity of the oxidized form of the redox couple to accept electrons and become reduced.
In plants ETC, QH2 is like what?
Cytochrome b6& is like what?
Plastocyanin (PC) is like what?
PSI transfers electrons from lumenal plastocyanin to what?
Ferredoxin works with ferredoxin-NADP+ reductase to do what?
reduce NADP+ to NADPH
Note: FAD in the middle! Thine E3 of PDH, only 1 electron at a time!
How is the H+ gradient different in plants then us?
Still use concentration gradient but thylakoid membrane much more permeable to ions, so electrical gradient isn’t strong at all, so concentration can be much more steep.
How efficient is ETC in chloroplast of plants?
How is NADPH regulated?
Summary slide
