Flashcards in Bio 4: Photosynthesis Deck (17):
Organisms that use light or chemical energy and inorganic molecules to synthesise complex organic molecules.
Organisms that ingest and digest complex organic molecules releasing chemical potential energy stored in them.
+Intermembrane space 10-20nm wide
+Folded into lamellae (stack: granum)
+Stroma - fluid filled matrix
Molecules that absorb light energy. Each pigment absorbs a range of wavelengths in the visible region and has its own distinct peak of absorption.
Magnesium iron in it
Chlorophyll a has two forms - 680 and 700
680 is in PSII, 680nm
700 is in PSI, 700nm
a absorbs blue light
Carotene - orange
Xanthophyll - yellow
Light dependent stage
In the thylakoid membrane
Water (in LDS)
+ source of hydrogen ions for chemiosmosis
+ source of electrons
Making of ATP from ADP and P in the presence of light.
Molecules that transfer electrons.
Chemicals that accept electrons from another compound. They are reduced while acting as oxidising agents.
+No redNADP made
+No photolysis of water
+Small amount of ATP made
+PSI & PSII
+ATP is made
+Photolysis of water
+redNADP is made
Light independent stage
Takes place in the stroma, also called the Calvin cycle. carbon dioxide is fixed and used to build complex organic molecules.
CO2 combines with RuBP, makes GP
GP is reduced and phosphorylated making TP (+ NADP and ADP + P)
TP is phosphorylated
5/6 TP becomes RuBP
+More electrons for photophosphorylation
+Therefore more ATP and redNADP
+More GP is reduced to TP
(High TP and RuBP, low GP)