Photosynthesis (for Exam) Flashcards
What do the xylem transport?
Water and nutrients
What do the phloem transport?
Organic molecules
Where do the light reactions happen?
Thylakoid
What part of the system absorbs energy from light?
Photosystem two
What happens when photosystem two absorbs light?
It takes two water molecules and splits it into electrons, hydrogen ions, and oxygen. The oxygen atoms become O2 and get released. The electrons that have been split are also energized.
What carries electrons?
Electron carriers
What happens when electrons are carried to the cytochrome complex?
The electrons are used to pump Hydrogen ions into the thylakoid lumen. This creates a concentration gradient.
What happens when photosystem one receives electrons?
It re-energizes the electrons by absorbing light energy. The electrons get passed on to the last electron carrier.
What happens when the electrons get to the final electron carrier?
The electrons interact with NADP+ and H to make NADPH.
What happens when the hydrogen ions go through the ATP synthase?
The Hydrogen ions provide energy, allowing ATP to combine ADP and another inorganic phosphate to make ATP.
Where does the light independent reaction take place?
stroma
What are the three stages of photosynthesis?
carbon fixation, reduction, regeneration
What happens in carbon fixation?
CO2 combines with three RuBP making six 3-PGA. This reaction is catalyzed by the enzyme RuBP.
What happens in reduction?
ATP and NADPH are used to convert the 3-PGA molecules into six G3P
What happens in regeneration?
One of the six G3P molecules is released to make glucose. The other ones are recycled to REGENERATE three RuBP. This process requires ATP.
