Photosynthesis Flashcards
(14 cards)
What do the light independent reactions do?
(Calvin cycle)
Converts energy within ATP and NADPH to sugar
What do the light dependent reactions do?
Convert solar energy to ATP and NADPH
Where do the light dependent reactions take place?
They thylakoid membrane within the chloroplast.
How is energy captured and what reaction is it part of?
Part of the light dependent reactions.
Both photosystems
Energy from a captured photon is transferred to electrons in the chlorophyll allowing the electron to jump to a higher orbital- excited state.
Energy is released to other molecules until it reaches the reaches the reaction center.
Where is the reaction center located?
Next to the ETC
What happens in photosystem 2 after the energy from the photon is captures?
The chlorophyll molecule that has been stripped of its electron will replace an electron from H2O.
What happens in photosystem 1?
Captures light energy and transfers to proton, then used electrons that have travelled down ETC from photosystem 2 to replace electrons lost.
They are then used to reduce NADP to NADPH
How is energy produced during the light dependent reactions?
H gradient is created in the thylakoids space. As h moves back into the storms the released potential energy is used to phosphorylase ADP and free phosphates to ATP
What are the main components of the light independent reactions?
(The Calvin cycle)
Carboxylation/ fixation
Reduction
Regeneration
What happens during carboxylation?
CO2 is attached to a 5 carbon sugar by rubisco
What happens during reduction?
The sugar is reduced into triode phosphTe molecules. ATP is used to activate the sugar for the reduction reaction and NADPH donated electrons.
What happens during regeneration?
Only one triode phosphate molecule leaves the cell, the rest are used to regenerate RuBP. ATP is used for activation.
What was the first photosynthetic organism?
Cyanobacteria
What is the purpose of the Calvin cycle?
Makes CO2 organic (C-H)
