IB Biology Topic C1.3.13 Reduction of NADP by Photosystem I Revision Notes (HL)

IB Biology Topic C1.3.13 Reduction of NADP by Photosystem I Revision Notes (HL) | RevisionDojo

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Photosystem I Re-energises Electrons to Reduce NADP+ to Reduced NADP

In the light-dependent reactions, photosystem I (PSI) carries out the final electron transfer that reduces NADP+ to reduced NADP (NADPH).
This step converts light energy into chemical energy stored as reducing power.
Reduced NADP is then passed to the Calvin cycle, where it supplies electrons for the light-independent reactions.

Analogy

Photosystem I works like a solar panel that captures light and uses it to excite electrons.
Those excited electrons are then used to reduce NADP+ to reduced NADP.

NADP Is an Electron Carrier That Exists in Two Forms

NADP (nicotinamide adenine dinucleotide phosphate) is the electron carrier used in photosynthesis.
NADP+ is the oxidised form, which can accept electrons.
Reduced NADP (NADPH) is the reduced form, which carries high-energy electrons and a hydrogen ion.

Common Mistake

Do not confuse NADP with NAD, which is used in cell respiration.
NADP has an extra phosphate group and is specific to photosynthesis.
Write the forms as NADP+ and reduced NADP, never as NADPH2 or NADPH+.

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Photosystem I Re-energises Electrons to Reduce NADP+ to Reduced NADP

In the light-dependent reactions, photosystem I (PSI) carries out the final electron transfer that reduces NADP+ to reduced NADP (NADPH).
This step converts light energy into chemical energy stored as reducing power.
Reduced NADP is then passed to the Calvin cycle, where it supplies electrons for the light-independent reactions.

Analogy

Photosystem I works like a solar panel that captures light and uses it to excite electrons.
Those excited electrons are then used to reduce NADP+ to reduced NADP.

NADP Is an Electron Carrier That Exists in Two Forms

NADP (nicotinamide adenine dinucleotide phosphate) is the electron carrier used in photosynthesis.
NADP+ is the oxidised form, which can accept electrons.
Reduced NADP (NADPH) is the reduced form, which carries high-energy electrons and a hydrogen ion.

Common Mistake

Do not confuse NADP with NAD, which is used in cell respiration.
NADP has an extra phosphate group and is specific to photosynthesis.
Write the forms as NADP+ and reduced NADP, never as NADPH2 or NADPH+.

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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic C1.3.13: Reduction of NADP by Photosystem I Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Photosystem I Re-energises Electrons to Reduce NADP+ to Reduced NADP

NADP Is an Electron Carrier That Exists in Two Forms

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Photosystem I Re-energises Electrons to Reduce NADP+ to Reduced NADP

NADP Is an Electron Carrier That Exists in Two Forms

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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