light dependant reaction Flashcards
(19 cards)
Where does this take place?
In the grana of chloroplasts
What are the products?
ATP, reduced NADP, oxygen
What is the first stage to the flow of electrons in this reaction?
Light energy is absorbed by the chlorophyll
What does this result in?
Photoionisation which releases electrons and chlorophyll becomes positively charged
What is the second stage?
Electrons are raised to a higher energy level
What is the third stage?
Water is split through photolysis which releases electrons, protons and oxygen
What is the fourth stage?
The electrons replace those lost by chlorophyll in photoionisation
What is the next stage?
The electrons are passed down an electron transport chain on the thylakoid membrane
What happens during each transfer?
Energy is released
What is the next stage?
The electrons are transferred to the second chlorophyll
What is the next stage?
Light energy is absorbed by that chlorophyll causing photoionisation
What is the next stage?
The electrons are accepted by NADP
What does NADP also accept?
The protons from the photolysis of water
What does the NADP become?
Reduced
What is the first stage in the production of ATP in this reaction?
As the electrons move down the electron transport chain, energy is released
What is the second stage?
This energy is used to pump protons from the stroma into the thylakoid
What is established?
A proton gradient
What is the next stage?
The protons diffuse down their concentration gradient into the stroma via the enzyme ATP synthase
What is the energy transferred from the movement of protons used in?
To phosphorylate ADP to form ATP
