Page 69 - The Manga Guide to Biochemistry

light Thylakoid lumen

chloro- STEP 1 (Photosystem II)
phyll
Sunlight strikes the
chlorophyll.*

Photosystem I ATP STEP 2
The light energy causes
Photosystem II Cytochrome b6-f synthase
an excited state in the
light Thylakoid lumen chlorophyll so an

chloro- electron e- is emitted
phyll and passed along. At
the same time, a proton
H+ accumulates in the

thylakoid lumen.

e- stands for this
electron.

Photosystem I ATP

Photosystem II Cytochrome b6-f synthase

light Thylakoid lumen

chloro- STEP 3 (Photosystem I)
phyll
The electron (e- ) and A
proton are captured
by NAPD+, and NADPH is

produced.

Photosystem II Photosystem I ATP STEP 4
Cytochrome b6-f synthase
When the protons (H+ )
light Thylakoid lumen that were collected
in the thylakoid lumen
chloro- are about to leave the
phyll thylakoid according to the
concentration gradient,**
they pass into ATP synthase.

At this time, ATP is
synthesized from ADP.

** A force which causes a substance
to naturally flow from a high con-
centration to a low concentration.

Photosystem I ATP

Photosystem II Cytochrome b6-f synthase

* Photosystem I also has chlorophyll. Energy is received here as well,

and electrons that were transported from Photosystem II are once

again excited.

Oh, I get it! When I
see it laid out step-
by-step, it makes way

more sense!

Because of this
"electron flow,"
NADPH and ATP are

produced!