phtosynthesis 1 Flashcards
(27 cards)
What is the best environment for a horse to grow up?
In a stable environment.
What are the two main phases of photosynthesis?
- Photo Phase
- Synthesis Phase
What is the overall equation for photosynthesis?
6CO2 + 12H2O -> 6O2 + 6H2O + C6H12O6
What are the requirements for the photo phase of photosynthesis?
- Light energy
- Enzymes
- Chlorophyll
What does the photo phase produce?
- 6 O2
- 12 ATP
- 12 NADPH
What does the synthesis phase of photosynthesis use?
Products from the photo phase
What does the synthesis phase produce?
- 6 H2O
- C6H12O6
What happens to a photon when it is absorbed?
It excites an electron from a lower energy state to an excited higher energy state.
What is a primary electron acceptor?
A molecule capable of accepting electrons and becoming reduced during photosynthesis.
What are the two types of chlorophyll?
- Chlorophyll a
- Chlorophyll b
What is the function of chlorophyll a?
Becomes oxidized and donates an electron to a primary electron acceptor.
What is the role of chlorophyll b?
Accessory pigments that transfer electrons to chlorophyll a.
Define absorption spectrum.
A plot of the amount of light energy of various wavelengths that a substance absorbs.
Define action spectrum.
A plot of the effectiveness of light energy of different wavelengths in driving a chemical process.
What are photosystems made of?
Various proteins and pigment molecules.
What is the range of pigment molecules contained in antenna structures of photosystems?
250 - 400 pigment molecules.
What does Photosystem I absorb light at?
700 nm wavelength.
What does Photosystem II absorb light at?
680 nm wavelength.
What happens when light hits the antenna complex in Photosystem II?
The energy excites an electron in P680.
What is released during the splitting of water in Photosystem II?
- Oxygen
- Protons
What is photolysis?
The splitting of water.
What is the role of PQ in the light-dependent reactions?
Acts as a shuttle and pulls a proton from the stroma into the lumen.
What does P700 do when hit by light energy?
It oxidizes and passes the electron to ferredoxin.
What is formed when NADP+ is reduced?
NADPH.
