Photosynthesis II Flashcards
-Converts inorganic CO2 into carbohydrate
-Final product is Glyceraldehyde Phosphate (G3P)
The Calvin Cycle
3 Phases of Calvin Cycle
-Carbon Fixation
-Reduction
-Regeneration of CO2 acceptor
Calvin Cycle:
Covalent attachment of inorganic carbon to an organic
acceptor molecule
Carbon fixation
Calvin Cycle:
The addition of electrons,
protons, and energy to make a
carbohydrate
Reduction
Calvin Cycle:
Reorganization & rearrangement of
remaining products to regenerate the initial reactant
Regeneration of CO2 acceptor
3RuBP + 3CO2 —> 6 3PG
Carbon Fixation
Phosphorylate and reduce the products of carbon fixation
Reduction of Carbon
-Convert five 3C G3P into three 5C RuBP
-Consume 3 ATPs
Regeneration of the CO2 Acceptor
-Build one 3-carbon molecule: G3P
-“Fix” 3 CO2
-Consume 9 ATPs
-Consume 6 NADPHs
Calvin Cycle
-Energy Storage
-starch is a polymer of glucose
-G3P is a precursor of glucose
Starch synthesis
-Energy Transport
-Disaccharide of glucose and fructose
-The primary transport sugar in plants
-G3P is a precursor of glucose and fructose
Sucrose synthesis
G3P ______ in cytosol and mitochondria generates ATP for cellular needs
oxidation
When sun strikes something it is?
-Reflected
-Transmitted
-Absorbed
Photosynthesis requires ____
absorption
Photosynthetic pigments are localized within the _____ _______
thylakoid membranes
Photosynthetic Pigments:
-Green
-Chemical link between the sun and most life on earth
Chlorophylls
Photosynthetic Pigments:
-Yellow and Orange
Carotenoids
Photosynthetic Pigments:
Red
Phycobilin and phycoerythrin
Light Dependent Reaction:
Absorbed light energy is converted and stored transiently into two chemical forms
-ATP
-NADPH
____ is a by-product of photosynthesis
O2
Pigments are organized into membrane-associated complexes called _____
photosystems
Energy to phosphorylate ADP comes from light
Photophosphorylation
Cells must reduce NADP+ to
NADPH
Chloroplasts contain 2 different photosystems
PS I: P700 pigment
PS II: P680 Pigment
(PS II functions before PS I)
