Ligh dependent reactions Flashcards
where uscthe clustered arregment of pigments in
thylakoids
whag does each PS have
about 12 chlorophyll molecules and a few carotenoids
an molecule that accepts electrons
two photo systems name
PSII and PSI
whats a reaction center
where all absorbed sunlight energy is passed to a specialized electron accepting chlorophyll a molecule
what are photo systems
when light energy is passed from other pigments ti the reaction center and is now “ excited “ means the electron has been raised ti a higher energy level
step 1 of light dependent reaction
- water H2O splits into H+ , O2 and electrons
- the electrons enter PSII and start ti get energized
step 2 of light dependent reaction
-energized electrons passes through series of electron x cd carrying molecules= electron transport chain
-as electrons pass through acceptors , falls ri a lower energy state
- released energy pushes H* ions from stroma to inner thylakoid space
- H+ concentration gradient is higher inside and when pushed out of ATP synthase it provides energy to generate ATP from ADP+P
steoo po 3 of light dependent reaction
-while itger ste ppl is happening light is also absorbed by photosynthesis
- energy also transferred to reaction center in PSI and become excited
-another high energy electron is passed tkk ok an electron accepting molecule
- the list electron in PSI is replaced by thr one from PSII after passing through ETC
Step 4 of light dependent reaction
- electron fromPSI is used tk reduce NADP+ into NADPH
- NADPH has now more ebergy reducing power used in light independent reaction
the electron from H2O on dose what
replaces the electron lost in PSII
What is light reaction all about
charging battery
where is the oxygen we breath from
from the breakdown of H2O in the Thylakoid
reaction center is full of
chlorophyll
whats the ETC electron transport chain
stairway for electrons from PSII to PSI where electrons lose energy
whats the thylakoid Lamen
inside of thylakoid membrane
