photosynthesis Flashcards
NAD+
- an electron carrier / co-enzyme
- functions as an oxidizing agent during respiration
Regeneration in dark reactions
6 ATP are used to convert 10 PGAL to RuBP (ribulose biphosphate)
Reduction in a dark reaction
12 ATP and 12 NADPH are used to convert 12 PGA to 12 PGAL
Carboxylation in dark reactions
6CO2 combine with RuBP (ribulose biphosphate) to produce 12 PGA
Noncyclic Phosphorylation
Takes lights energy and electrons from H20 to make energy-rich molecules and NADPH
7 steps for Non cyclic Photo phosphorylation
1) Photosystem II
2) Primary Electron acceptor
3) Electron Transport Chain
4) Phosphorylation
5) Photosystem 1
6) NADPH
7) Photolysis
In autotrophic eukaryotes …
Photosynthesis occurs in thylakoids
Photosynthesis is summarized as
6CO2 + 12 H20 + Light Energy —> C6H12O6 + 6O2 +6 H2O
Chloroplasts split water into
Hydrogen and Oxygen , incorporating the electrons of hydrogen into sugar molecules
Photosynthesis is a redox process where …
H2O is oxidized (loses an electron)
CO2 is reduced (gains electron
What reaction in the thylakoid membrane split water releasing O2 , producing ATP , and forming NADPH
Light reactions
Where does the Calvin Cycle (dark reactions) take place ?
In the stroma
A photosystem is …
Composed of a reaction-center complex surrounded by light-harvesting complexes the funnel energy of phototons to the reaction center complex
What happens in the primary electron acceptor ?
- a special pair of reaction center chlorophyll a molecules absorbs energy
- one of its electrons is boosted to a higher energy level and sent to he primary electron acceptor
How many chlorophyll a molecules are in the reaction-center complex in photosystem ll
P680
How many chlorophyll a molecules are in the reaction-center complex in photosystem l
P700
Linear electron flow during light reactions and uses …
both photosystems and produces NADPH , ATP , and oxygen
what happens during chemiosmosis
both mitochondria and chloroplasts electron transport chain generate an H+ (proton) gradient across a membrane . ATP synthase uses this proton-motive force to synthesize ATP
The light reactions of photosynthesis supply the Calvin Cycle with …
ATP and NADPH
What represents the flow of electrons during photosynthesis ?
H20 –> NADPH –> Calvin cycle
How is photosynthesis similar in C4 plants and CAM plants ?
In both cases rubisico is not used to fix carbon initially
What is the correct distinction between autotrophs and heterotrophs ?
Autotrophs but not heterotrophs can nourish themselves beginning with CO2 and other inorganic nutrients
What does NOT happen during the Calvin cycle ?
release of oxygen
In mechanism , phosphorylation is most similar to
Oxidative phosphorylation in cellular respiration
