Lesson 7.9
Chemiosmosis powers ATP synthesis
in the light reasons
Jill G.
Jordan D.
Missy F.
Jeremiah J.
Chemiosmosis powers ATP synthesis in the light reasons
Chemiosmosis has to do with the understood energy
that is produced from this equation that powers the plant with ATP.
A. Process is analogous with that of cellular respiration’s electron
transport system.
I. Remember that the ATP synthase is powered by the
concentration gradient of hydrogen ions across the membrane
1.
II. The ions are pumped in the opposite direction this
time. This means they are pumped to the low concentration
intermembrane space also called the stroma in plants
2. How it works
D. To create the mass
amounts of ATP, remaining H+
A. You learn the path of
electrons in chloroplasts by studying molecules in the thylakoid
its ETC with all the photosystems and interior are shot through ATP
synthase and into the stroma
such
with ATP synthase
B. This process creates the
concentration gradient that drives
chemiosmosis, the passing of H+ from
high to low concentration through ATP
synthase
C. When the electrons go
down the ETC, this energy creates an
opportunity for a H+ ion to pass
through the membrane unfaciltated
Stroma (low H+ concentration)
H+
H+
Light
ATP
ADP + P
Light
NADP+
+
NADPH
H+
+
H+
H+
H20
1/2 O2 + 2 H+
Photosystem II
Electron
Transport
Chain
H+
H+
H+
H+
H+
H+
ATP Synthase
Photosystem I
H+
Thylakoid
membrane
Photophosphorylation
•
•
•
•
•
Located in the thylakoid
membrane of the chloroplast
Hydrogen ions are pumped
across the membrane from the
stroma to the thylakoid space •
Chemiosmotic production of ATP
is called photophosphorylation
Initial energy input to produce
ATP is light energy
Chloroplast transforms light energy •
into chemical energy of ATP
•
Final electron acceptor is NADP+
where they are stored at a high
state of potential energy in NADPH
•
•
Oxidative Phosphorylation
•
Located along the cristae in the
Chemiosmosis occurs in
both processes to
generate ATP
mitochondria
•
Hydrogen ions are pumped across the
membrane from the intermembrane
space into the mitochondrial matrix
Use the potential energy of a
concentration gradient of
hydrogen ions
ATP synthase is present in both
processes and is driven by the
concentration gradient of
hydrogen ions
•
ATP and NADPH produce during this
process are used in the Calvin Cycle,
the next process
Product of both
processes are ATP
•
•
Chemisomotic production of ATP is
called oxidative phosphorylation
•
•
Initial energy input to produce
ATP is glucose
Mitochondria transfer chemical
energy from food into ATP
Final electron acceptor is oxygen
where they are stored at a low
energy level in water
Photophosphorylation
•
•
•
•
•
Located in the thylakoid
membrane of the chloroplast
Hydrogen ions are pumped
across the membrane from the
stroma to the thylakoid space •
Chemiosmotic production of ATP
is called photophosphorylation
Initial energy input to produce
ATP is light energy
Chloroplast transforms light energy •
into chemical energy of ATP
•
Final electron acceptor is NADP+
where they are stored at a high
state of potential energy in NADPH
•
•
Oxidative Phosphorylation
•
Located along the cristae in the
Chemiosmosis occurs in
both processes to
generate ATP
mitochondria
•
Hydrogen ions are pumped across the
membrane from the intermembrane
space into the mitochondrial matrix
Use the potential energy of a
concentration gradient of
hydrogen ions
ATP synthase is present in both
processes and is driven by the
concentration gradient of
hydrogen ions
•
ATP and NADPH produce during this
process are used in the Calvin Cycle,
the next process
Product of both
processes are ATP
•
•
Chemisomotic production of ATP is
called oxidative phosphorylation
•
•
Initial energy input to produce
ATP is glucose
Mitochondria transfer chemical
energy from food into ATP
Final electron acceptor is oxygen
where they are stored at a low
energy level in water
Photophosphorylation
Oxidative Phosphorylation
• Located in the
________________membrane
of the chloroplast
• Located along the _________in
the mitochondria
• Hydrogen ions are pumped
across the membrane from the
________to the_________ • _______________occurs• Hydrogen ions are pumped across the
membrane from the
_____________
in both processes to
_______________space into the
generate
ATP
• Chemiosmotic production of ATP
mitochondrial __________
is called____________________
• Use the ____________energy
of a concentration gradient of • Chemisomotic production of ATP is
• Initial energy input to produce
called__________ _________________
hydrogen ions
ATP is ___________ energy
•
Chloroplast transforms light energy
into chemical energy of ATP
•
Final electron acceptor is ________
where they are stored at a
______state of potential energy in
NADPH
•
•
_______ ______________is
present in both processes and
is driven by the concentration
gradient of hydrogen ions
•
Product of both
processes are ATP
ATP and NADPH produce during
this process are used in the
_________Cycle, the next
process
•
Initial energy input to produce
ATP is ____________
•
Mitochondria transfer chemical
energy from food into ATP
• Final electron acceptor is
__________where they are stored
at a ______energy level in water