Plant Photosynthesis Flashcards
(19 cards)
What do redox reactions involve?
Involve the gain or loss of electrons
What do light reactions do?
They turn water and light energy into oxygen, ATP, and NADPH
What does the calvin cycle do?
Turns CO2, ATP, and NADPH into a 3 carbon sugar
What are the different compartments of chloroplasts?
Stroma, Thylakoids, and granum
What light spectra does chlorophyll a and b not absorb?
Green
What are the 4 ways that energy is released in photosynthesis?
Flouresense, heat, resource energy transfer, eduction/oxidation
What is the purpose of photosystem II?
feed excited electrons to the ETC
What does photosystem I produce?
NADPH
What is the purpose of cyclic electron flow?
Allows additional ATP products
What is chemiosmotic mechanism?
Artifically generates H+ gradient across thylakoid membrane, this allows for the H+ gradient to drive ATP production in absence of light
What is special about rubisco?
It is the most abundant enzyme on earth
What are the different characteristics of rubisco?
Has equal affinity for CO2 and O2, photorespiration leads to a net loss of fixed CO2, photorespiration rates are also higher at high temperatures
What are the characteristics of C4 plants?
CO2 concentrate as 4C compound, spatial seperation of CO2 uptake and fixation,
What are the characteristics of CAM plants?
open stomata and collect CO2 at night, temporal seperation of CO2 uptake and fixation, 500x less H2O loss
What is the main purpose in the calvin cycle?
to fix and reduce the C in CO2
How long ago did oxygenic photosynthesis evolve?
3 billion years ago
Do plant use oxidative phosphorlaytion and photophosphorylation?
They use both
What are the electron donor and acceptor in oxidative phosphorlaytion?
Electron donor is NADH and acceptor is O2
What are the electron donor and acceptor in photophosphorlaytion
Electron donor is H20 and acceptor is NADP+
