ATP- Photosynthesis Flashcards
What can the simple photosynthesis reaction be broken down into?
1) Light dependent reaction
2) Light independent reaction
Describe the light dependent reaction.
Uses light energy to split water and produce ATP and oxygen in the thylakoid membrane
Where are the thylakoid membranes located?
The chloroplasts
How many complexes does the light dependent reaction utilise?
4 complexes
What are the results of the light dependent reaction?
Produces oxygen, hydrogen and form ATP
What happens in complex 1 (PS2) of the light dependent reaction? (4 stages)
1) Chlorophyll molecules absorb photons of light
2) Chlorophyll electrons raised to a higher energy level
3) Creating a charge separation which drives photolysis of water
4) Produces Oxygen, hydrogen atoms and electrons
What is the significance of the protons produces by the photolysis of water?
Protons build up in the thylakoid lumen creating a proton gradient
What is the purpose of the electrons formed from the photolysis of water?
To replace the chlorophyll electrons
What is the purpose of absorbing light energy at the PS1 complex?
Used to pump protons from the Stroma to the Thylakoid lumen creating a proton gradient across the membrane
At complex 3 (FD) what happens to the electrons?
Recombined with a proton to form a H atom
What happens at the last complex of the light dependent reaction?
The proton gradient is used to drive the reaction of ADP + Pi giving ATP
What is the purpose of the light independent reaction?
To form glucose
What is step 1 of the Calvin Cycle?
CO2 + RuBP = 2x 3G-3-P (GLYCERATE PHOSPHATE)
What is the enzyme catalyses step 1 of the Calvin cycle?
Rubisco
Why is a lot of Rubisco required?
inefficient and slow enzyme
