L25: Photosynthesis, Photophosphorylation Flashcards
Respiration vs. fermentation mode of catabolism and ATP
- Respiration: Cell makes most of its ATP by oxphos
- Fermentation: cell makes all of its ATP by SLP
Which phosphorylation is more efficient?
- Oxphos
What is the terminal electron acceptor?
- Aerobic: O2
- Anaerobic: something other than O2 is the TEA. i.e. NO3-, SOF2-
What are the possible fates of pyruvate?
- Aerobic CR: O2 in the environment so cell uses O2 as TEA and there is an ETC
- Anaerobic CR: no O2 as a TEA but the cell has other TEA’s it can use
- Fermentation: No O2 and no other TEA can be used by the cell or can also be the lack of functional ETC
Plants are…
- Photolithoautotrophs
- Energy source = light
- Electrons = Inorganic (H2O)
- Carbon source = CO2
What is photosynthesis?
- Conversion of light energy into chemical energy (stored in the bonds of carbohydrates)
What are the 2 sets of reactions in photosynthesis?
- Light-dependent reactions: Photophosphorylation
- Light-independent reactions : Calvin Cycle
Where do both reactions occur?
- In the chloroplast
When you lose weight, where does the carbon mass end up?
- Breathing
The dry mass of wood is mostly carbohydrates. Where do the molecules that make up the dry mass of wood come from?
- The air (CO2)
How are the mitochondria and chloroplast linked?
- By their processes
- Carbs (reduced forms of carbon) are produced by chloroplasts from CO2
- The sugars then undergo catabolism (e.g. CR) to produce energy in the mitochondria
Describe photophosphorylation
- A photosynthetic ETC
- produces high energy intermediates, ATP and NADPH
Describe the Calvin cycle.
- uses ATP and NADPH to synthesize organic carbon from inorganic CO2. this is also called carbon fixation
