Unit 4: Cellular Processes - Light Reactions Flashcards
What is the equation for photosynthesis?
6CO2 + 6H2O yields C6H12)6 + 6CO2
What are electron acceptors?
Ions or molecules that receive electrons (reduced)
What are electron donors?
Ions or molecules that donate electrons (oxidized)
Why are plants green?
Plants are often green because chlorophyll reflects green light.
What organisms use light dependent reactions?
Photosynthetic organisms
Where in the cell do light dependent reactions happen?
They happen in the thylakoid membrane.
What is NADP+?
NADP+ is an electron acceptor.
What are the acceptor molecules for in the light reactions?
When the photon reaches the reaction center, an electron’s energy level is boosted an an acceptor molecule takes the electrons away.
What is water broken down into in the light reaction?
Hydrogen, oxygen, and electrons
What is photolysis?
The splitting of a molecule by light energy (photons)
What are the 4 pumps in light dependent reactions?
Photosystem II, Cytochrome B6, Photosystem I, and ATP synthase
What is ATP Synthase (what type of molecule)?
An enzyme
What happens in Photosystem I?
The electron is replaced by an electron from a carrier protein
What is NADP reductase?
NADP is reduced (electrons are added) to form NADPH
What does NADPH do?
NADPH carries energy to be used in light dependent reactions.
