Term
|
Definition
| Converts light energy to biochemical energy (ATP) and reducing power (NADPH). |
|
|
Term
| Light-Dependent Reactions |
|
Definition
| Photons of light are absorbed by pigments and excite electrons. |
|
|
Term
|
Definition
| Group of chlorophyll molecules. |
|
|
Term
|
Definition
Antenna complex with its associated electron transport chain.
Photosystem I responds to wavelengths of 700nm (P700). Photosystem II (which comes first) responds to wavelengths of 680nm (P680). |
|
|
Term
|
Definition
| Site where the two photosystems usually function. |
|
|
Term
|
Definition
| Becomes excited and passes e- to primary acceptor. The lost e- is then replaced by an electron from water being split by a light activated enzyme (photolysis). Photolysis of water generates O2 as waste product (oxygenic). Primary acceptor passes e- along e- transport chain and ATP is generated via proton motive force and chemiosmosis. PSII then passes e- to PSI. |
|
|
Term
|
Definition
| Light initiated breakdown. |
|
|
Term
|
Definition
| Process that generates O2 as a waste product. |
|
|
Term
|
Definition
| Becomes excited from PSII's e- and passes e- to its primary acceptor. e- passes along second e- transport chain and is eventually accepted by NADP+, generating NADPH. |
|
|
Term
|
Definition
| Cooperative action of PSI and PSII. Also called "Z-Scheme". Creates ATP and NADPH in a 1:1 ratio (however, calvin cycle requires more ATP than NADPH). |
|
|
Term
|
Definition
| Primary acceptor of PSI passes its e- along PSII's e- transport chain via the carrier "ferrodoxin". Does not release O2 and is thus anoxygenic. Makes up the extra ATP that the calvin cycle needs. |
|
|
Term
|
Definition
| Synthesis of ATP by PSII via proton motive force and chemiosmosis. |
|
|
Term
|
Definition
| Light-independent. Occurs in three phases: CO2 fixation, reduction, regeneration. To produce one G-3-P Calvin cycle uses 9 ATP and 6 NADPH (18 ATP and 12 NADPH to generate one glucose). Plants that generate G-3-P are known as C3 (3-carbon) plants. |
|
|
Term
|
Definition
CO2 Fixation: 3CO2 are combined with one RuBP (Ribulose biphosphate).
Reduction: uses ATP and NADPH.
Regeneration: Five G-3-P used to regenerate the 3RuBP used in CO2 fixation. Sixth G-3-P is the product. |
|
|
Term
|
Definition
| When RuBP is combined with O2. Does no generate sugar but still uses ATP. RuBP is kept in an anaerobic environment to prevent this. |
|
|
Term
|
Definition
| Gate-like structures that facilitate gas-exchange in plants. In hot/dry climates, stomata remain closes. THis causes a buildup of O2 and increases the risk of photorespiration. C4 and CAM plant's can work around this. |
|
|
Term
|
Definition
| CO2 is incorperated into 4-C organic acids and stored in mesophyll cells where O2 is generated. CO2 is released from acids into bundle-sheath cells where the calvin-cycle occurs. Rubisco is isolated from O2 by space. |
|
|
Term
|
Definition
| Stomata open only at night. CO2 is incorporated into 4-C acids and released in high concentrations during the day. Rubisco is isolated from O2 by time. |
|
|
