EOC REVIEW: CELLULAR PROCESSES- Photosynthesis (Light Reactions) Flashcards
What is photosynthesis?
Photosynthesis is the process in which light energy is converted to chemical energy in the form of sugars
What are electron acceptors?
Electron acceptors are ions or molecules that recieve electrons (are reduced) in chemical reactions (called oxidizing agents). The molecules become more negative.
What are electron donors?
They are ions or molecules that donate electrons (are oxidized) in chemical reactions (called reducing agents). These molecules become more positive.
What are pigments?
Pigments are electron acceptors.
What is water?
What is the donor.
What is the role of light energy in photosystems?
Light energy is absorbed by one or more of the pigments and is passed inward toward the reaction center.
What happens when the photon reach the reaction center?
An electron’s energy level is boosted and an acceptor molecule (or protein) takes the electrons away.
What does NADP reduce to?
NADPH.
How is water broken?
Photolysis
What is photolysis?
The splitting of a molecule by light energy (photons)
What is the hydrogen ion gradient?
The movement of hydrogen ions across the membrane
What happens at PSI in photosyntheis?
Light energy is absorbed, electrons transfer energy to NADP+ to form NADPH.
What is the role of NADP+?
It is an electron acceptor and it carries the energy to light independent reactions.
What is the role of ATP synthatse?
Hydrogen ions move down their concentration graident to form ATP.
What is the light reaction equation?
Water + ADP + NADP+ yields (light) NADPH + ATP + oxygen
