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BIO Chapter 10
Photosynthesis
| Term | Definition |
|---|---|
| Where does the Calvin cycle take place? | in the stroma |
| Where does photosynthesis take place? | In the chloroplast |
| Photosynthesis- | The conversion of light energy into chemical energy, food, or sugars |
| Formula for photosynthesis- | light energy + 6 CO2 + 12H2O Right Arrow C6H12O6 + 6O2 |
| What is needed for photosynthesis to occur? | carbon dioxide, water, and light energy |
| What does carbon get reduced to? | Sugar |
| What does water get oxidized to? | oxygen |
| What is produced by photosynthesis- | glucose, water, and oxygen |
| What are major features of photosynthesis? | Light reaction and the Calvin Cycle? |
| Phototroph- | ability to use light as energy |
| Chemotroph- | require chemical energy or food |
| Autotroph- | self feed, take carbon and form it into an orgain molecules |
| Heterotroph- | human |
| Chemoheterotroph- | get energy from another source |
| Do fungi photosynthesize? | no |
| First stage of photosynthesis- | light reactions |
| Light reactions- | a series of redox reactions that convert light energy into ATP and NADPH |
| Where is light absorbed into? | photosystem one and two |
| What is water used for in photosystem 2? – | water is split and its electrons are donated to electron transport chain |
| What is the function of the CTY complex? | pumps protons from the stroma into the lumen of the thylakoid, creating a proton motive force |
| Reaction center- | where electrons get pumped into in each photosystem |
| Primary electron acceptor- | where electrons get pumped out of in each photosystem |
| Photophosphorylation and chemiosmosis- | proton motive force is pumped through ATP synthase and produces ATP to be used in Calvin cycle |
| NADP+ reductase- | protein that reduces NADP+ into NADPH |
| How many electrons are moved down the electron transport chain? | 2 electrons |
| What gets put into the Calvin cycle- | 3 carbon, one at a time |
| Phase one of Calvin cycle- | carbon fixation, uses 6 ATP and 6 NADH |
| Phase two of Calvin cycle- | reduction, the output is one sugar molecule (G3P) |
| How many G3P molecules are used in the rest of the cycle?- | 5 G3P |
| How many ATP are used in the last steps of the Calvin cycle? | 3 ATP |
| Rubisco- | catalyzes the fixing of phosphate at first step of Calvin cycle |
| Cyclic electron flow- | electrons flow in a circle through photosystem one and surrounding proteins creating extra ATP |
| Pigment molecules- | embedded in thylakoid membrane, can absorb visible wavelengths of light, important to light reactions |
| Third phase of Calvin cycle- | regeneration phase |
| Photorespiration- | when the rubisco molecule grabs oxygen instead of CO2, and the plant can't produce sugar. |
| Pep carboxylase- | fixes carbon dioxide in special way. Can never make a mistake, only grabs carbon. Special enzyme |
| C4 plants- | plants that utilize pep carboxylase (i.e. corn) |
| CAM plants- | plants that maximize photosynthesis and eliminate photorespiration by fixing carbon at night and running the Calvin Cycle during the day. |