Light Dependent Reaction Flashcards
Where does it take place
In thylakoids membranes of chloroplasts
How does LDR start
Light energy is absorbed by chlorophyll in the photosystems
What does absorbing light energy cause
An electron to become excited and boost to a higher energy level
What happens to the chlorophyll once an electron is excited
Is gets photoionised
How does the electron release energy
What does the energy released do
The high energy electron is passed down a series of electron carriers
The energy is used to produce ATP
ATP equation
ADP + Pi -> ATP
What is some energy also used to do other than produce atp
Reduce NADP to form NADPH
What accepts the electron at the end of the electron train
NADP
Reduced NADP eq
NADP + H+ -> NADPH
What do atp and NADPH transfer to the LIR
ATP - energy
NADPH - hydrogen
What replaces the electron lost by the chlorophyll
Eq
A water molecule is split
2H2O -> 4H+ + 4e- + O2
When a water molecule is split what happens to the oxygen and hydrogen
Oxygen - released as waste product
Hydrogen - protons (H+) used to reduce NADP
What process makes ATP in LDR
Photophosphorylation
3 ways the energy from photoionisation of chlorophyll is used
Making ATP (photophosphorylation) Making NADPH Splitting water into protons (H+), electrons and oxygen (photolysis)
What’s the splitting of water called
Photolysis
3 things TP and GP are converted into
Carbohydrates (glucose, starch, cellulose)
Lipids
Amino acids
