Light reactions

Light reactions occur where?

Thylakoid membrane

Pigments

energy

Pigments are arranged in light harvesting complexes called ?

photosystems

A photosystem funnels energy to the

reaction center

What happens in the reaction center and how?

light energy becomes chemical energy through an electron trasnport chain

Pigments collect light energy whats the most abundant pigment in palnts

chlorophyll a

When a photon hits chlorophyll what happens

promoted to a higher energy state and is captured by an electron acceptor to move through an electron transport chain falling in energy (which can be harvested)

Photosystem is composed of

pigment molecules and reaction center

light reactions make what for the calvin cycle

ATP and NADPH

PS II- chlorophyll a loses e- (raises to higher energy level) so it replaces electrons by

stealing from water thats where where O2 comes from

PS II: The electrons from water r grabbed by electron acceptor and moves through what? producing what?

electron transport chain

ATP

These same electrons that were elevated drop down in energy and are grabbed by chlorophyll a in PSI, they are reenergized and produce

NADPH

The electrons that are being energized in photosystem II come from

H2O

Ultimately, the energy captured in the electron transport chain in photosystem 2 is used to create a proton gradient and

make ATP

During the light reactions light energy is used to pump protons into the thylakoid lumen in PS II. This proton gradient will be directly used to

make ATP

The purpose of a photosystem is to

Funell light energy to the reaction center to energize electrons