(Cell) Light Reactions Flashcards
Step 1
Light(photons) excites electron in photosystem 2(PS2) to the NADP reductase; produces NADPH from NADP+ and H+
Step 2
Electron is pulled from photosystem 1(PS1) to photosystem 2(PS2)
Step 3
Electrons are produced from photolysis of water, in which oxygen and hydrogen ions are produced
Step 4
Hydrogen ions are drawn into the inner thylakoid through the cytochrome
Step 5
The chemiosmotic gradient created by the amount of hydrogen ions in the inner thylakoid causes the hydrogen ions to leave via the proton channel protein
Step 6
ATP is produced on the ATP synthase, which is then bumped out by the leaving proton
Step 7
The leaving hydrogen ions produce NADPH with the electron from photosystem 2(PS2) and NADP+
What is the reaction that uses light to split water called?
Photolysis reaction
What is the buildup of hydrogen ions in the inner thylakoid known as?
A chemiosmotic gradient
Where do light reactions take place?
Thylakoid
What is NADP+?
A coenzyme that carries H+
Autotrophs vs. Heterotrophs
Autotrophs are “self-feeders”, sustaining themselves without eating anything derived from other living beings
Heterotrophs obtain their organic material by the second major mode of nutrition
What pair of chlorophyll a molecules are located in Photosystem II?
P680
What pair of chlorophyll a molecules are located in Photosystem I?
P700