8.3 The Processes of Photosynthesis Flashcards
Photosystems
clusters of chlorophyll and proteins in thylakoids
Why are photosystems essential to photosynthesis
bc they are surrounded by accessory pigments
Photosystems are a part of
photosynthesis
what is the function of photosystems
to absorb sunlight and generate high energy electrons which are passed to electron carriers in the thylakoid membrane
Do all plants have the same photosystems
no
How many photosystems are there
2
what are the names of the photosystems
photosystem 1 and photosystem 2 (but in roman numerals )
Which photosystem comes first in photosynthesis
photosystem 2
What is the function of photosystem 2
to absorb light to kickstart the light-dependent reactions (aka photosynthesis)
Where is light absorbed in photosystem 2
electrons in the pigments
What is the symbol for high energy electrons
e-
What happens to the electrons after they absorb the light energy
they are passed down to the electron transport chain
is an electron transport chain included in photosystem 1
yeessss
where is the electron transport chain found
thylakoid membrane
what is the electron transport chain
a series of electron carrier proteins that move high energy electrons during ATP generated reactions
Is the electron transport chain in cellular respiration and photosynthesis the same?
no
What is the last step of photosystem 2
enzymes on the inner surface of the thylakoid membrane break up water into 2 electrons, 2 H+ and 1 oxygen
Since the high energy electrons are always transferred to the electron transport chain does chlorophyll ever run out of electrons?
no the electrons that are transferred to the electron transport chain are replaced by electrons that are released when enzymes break down water
What signalizes the end of photosystem 2
water is broken down by enzymes
Is there a step between photosystem 2 and photosystem 1?
yesh - intermediate step - electron transport chain