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Questions and Answers
What end products are generated from Non-Cyclic Photophosphorylation?
What end products are generated from Non-Cyclic Photophosphorylation?
- ADP and O2
- NADP+ and glucose
- ATP and NADPH (correct)
- ATP and glucose
Which process describes the return of electrons to the chlorophyll molecule?
Which process describes the return of electrons to the chlorophyll molecule?
- NADPH formation
- ATP synthesis
- Cyclic Phosphorylation (correct)
- Water Splitting
What role do protons play in Non-Cyclic Photophosphorylation?
What role do protons play in Non-Cyclic Photophosphorylation?
- They form NADPH by combining with NADP-. (correct)
- They replace the electrons lost by chlorophyll.
- They are used to generate glucose.
- They are absorbed from the atmosphere.
During the Dark Stage, what is the primary source of energy for producing glucose?
During the Dark Stage, what is the primary source of energy for producing glucose?
What occurs in the stroma of the chloroplast during the Dark Stage?
What occurs in the stroma of the chloroplast during the Dark Stage?
Flashcards
Cyclic Phosphorylation
Cyclic Phosphorylation
A light-dependent process in photosynthesis where electrons return to the chlorophyll molecule after passing through electron carriers, producing ATP.
Non-Cyclic Photophosphorylation
Non-Cyclic Photophosphorylation
A light-dependent process in photosynthesis where electrons leave the chlorophyll molecule and are used to produce ATP and NADPH, which are used to make glucose later. Water is split to replace the lost electrons.
Dark Stage of Photosynthesis
Dark Stage of Photosynthesis
The stage of photosynthesis that does not require light, using ATP and NADPH produced during the light stage to convert carbon dioxide into glucose.
ATP
ATP
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NADPH
NADPH
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Study Notes
Light Stage
-
Pathway 1: Cyclic Phosphorylation (Grana)
- Light energy excites electrons in chlorophyll.
- Excited electrons are passed down electron carriers.
- Energy from electron transfer creates ATP from ADP and inorganic phosphate.
- This reaction returns electrons to the chlorophyll.
- End product: ATP
-
Pathway 2: Non-Cyclic Photophosphorylation (Grana)
- Light energy excites two electrons in chlorophyll.
- Excited electrons are passed down electron carriers.
- Energy from electron transfer creates ATP from ADP and inorganic phosphate.
- Electrons combine with NADP+ to form NADPH.
- Electrons do not return to the chlorophyll.
- Water is split into protons (H+), electrons (e-), and oxygen (O2), replenishing electrons lost from chlorophyll.
- Protons accumulate in a proton pool and are used to create NADPH.
- End products: ATP, NADPH, O2
Dark Stage
- Location: Stroma
- Energy Source: ATP breakdown
- Process: CO2 from the air enters the chloroplast.
- NADPH donates its electrons and protons to CO2, forming glucose (C6H12O6).
- NADP+ is regenerated for use in the light stage.
- ADP is regenerated for use in the light stage.
- End product: Glucose
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