Photosynthesis Quiz Flashcards
Equation for photosynthesis
Light + CO2 + H2O = C6H12O6 + O2
Light
light dependent e- transport chain, photosystems harvest light
CO2
RuBisCo fixes CO2 in Calvin Cycle
H2O
PSII of e- transport chain, e- is harvested from this H2O
C6H12O6
Glyceraldehyde 3-phosphate is used to build sugars (carb production)
O2
PSII by product
What product of the Calvin cycle leaves to make sugars?
Glyceraldehyde 3-phosphate
What enzyme fixes CO2 from the atmosphere?
RuBisCO
How do PSI and II harvest light?
By pigments
Which process uses the NADPH and ATP produced by electron transport?
Calvin Cycle
How many protein complexes harvest light during photosynthesis?
2
What are the products of the photosynthetic electron transport?
NADPH + ATP
Where is the light energy harvested by photosynthesis stored?
Chemical bonds
Where does photosynthesis occur?
The chloroplast
What is the starting material for the photosynthetic electron transport chain and what products are produced?
Light & H2O = NADPH & ATP
What is the starting material for the Calvin Cycle and what products are produced?
ATP, NADPH, CO2 = Glyceraldehyde 3-phosphate
What is the role of PSII
Absorb light, use energy to break H2O into O and H, electron is harvested to start the e- transport chain
Which two ions are produced when PSII splits water?
O2-. 4H+
Each of the two ions enables the production of the two products. Link each ion to the product made from it
4H+ - ATP, O2- = NADPH
What is the role of PQ
PQ receives the e- along with 2 protons from PSII and passes the e- to cytb6f
What is the role of cytb6f?
Cytb6f passes the e- to PSI so it may be reenergized with more light
What is the role of PC?
Carries/shuffles the e- from cytb6f to PSI
What is the role of PSI?
Regeneration / reenergize, linked with ferrodoxin
What is the role of Fdx?
Fdx transports e- to NADP reductase
What is the role of NADP Reductase?
Reduces NADP to NADPH?
What is the role of ATP synthesis?
ATP utilizes the proton gradient created by PSII and PQ to make ATP
Which products will be used by the Calvin Cycle?
ATP, NADPH, CO2
The herbicide atrazine is an enzyme inhibitor. Which of the electron transport chain enzymes is inhibited by atrazine? Why would this kill a plant? Do you think this compound would be toxic to animals?
Photosynthesis is ultimately blocked as electron transport PSII is inhibited by atrazine. This would kill plants with photosynthesis being unable to take place and no energy being capable of producing anything from the plants. This would also be toxic to animals as no ATP or NADPH is produced from this process.
What products from the electron transport chain are used during the reduction stage
ATP and NADPH
What are the fates of the G3P molecules
The G3P molecules leave to make sugars in carb production, only some are converted again in the regeneration phase
What is the purpose of the regeneration phase?
For the cycle to continue and begin again
