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Questions and Answers
Where do light reactions of photosynthesis take place?
Where do light reactions of photosynthesis take place?
What is the net equation of photosynthesis?
What is the net equation of photosynthesis?
6CO2 + 6H2O → C6H12O6 + 6O2
Photosynthesis occurs in both prokaryotes and eukaryotes.
Photosynthesis occurs in both prokaryotes and eukaryotes.
True
What are the two types of chlorophyll found in eukaryotes?
What are the two types of chlorophyll found in eukaryotes?
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What is the primary role of accessory pigments in photosynthesis?
What is the primary role of accessory pigments in photosynthesis?
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What process uses ATP and NADPH to fix CO2?
What process uses ATP and NADPH to fix CO2?
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The trapping of light and production of O2 take place in the ______.
The trapping of light and production of O2 take place in the ______.
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Chlorophyll absorbs light primarily in the green spectrum.
Chlorophyll absorbs light primarily in the green spectrum.
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What type of chlorophyll do prokaryotes contain?
What type of chlorophyll do prokaryotes contain?
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Match the following components with their roles in photosynthesis:
Match the following components with their roles in photosynthesis:
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Study Notes
Photosynthesis Overview
- Photosynthesis converts carbon dioxide (CO2) and water (H2O) into carbohydrates and oxygen (O2) with the net equation: 6CO2 + 6H2O → C6H12O6 + 6O2.
- Two main processes involved: light reactions (generate O2, ATP, and NADPH) and dark reactions (fix CO2 into sugars using ATP and NADPH).
Chloroplast Structure and Function
- In prokaryotes, photosynthesis occurs in granules attached to the plasma membrane.
- Eukaryotic photosynthesis occurs in chloroplasts, which consist of:
- Inner and outer membranes with an intermembrane space.
- Grana (stacks of thylakoid disks) where light reactions occur and O2 is produced.
- Stroma, site for dark reactions.
Chlorophyll and Light Absorption
- Chlorophyll types: Chlorophyll a (found in all photosynthetic organisms) and Chlorophyll b (found in eukaryotes like plants and algae).
- Photosynthetic bacteria, unlike cyanobacteria, contain bacteriochlorophylls and only have one photosystem.
- Structure of chlorophyll includes a tetrapyrrole ring similar to heme, with magnesium (Mg II) at the center and a long hydrophobic phytol side chain.
Light Reaction Mechanism
- Chlorophyll absorbs light predominantly in red (600-700 nm) and blue (400-500 nm) wavelengths, inversely related to light energy.
- Accessory pigments help capture additional light and transfer energy to chlorophylls.
- Photosystems consist of proteins and chlorophylls; they facilitate light reactions where light energy is harvested.
Photosynthetic Unit
- Each photosynthetic unit contains numerous chlorophyll molecules bound to proteins in antenna complexes.
- Energy from light-harvesting chlorophylls is passed to reaction center chlorophylls, essential for the efficiency of light reactions.
Importance and Implications
- The role of photosynthesis in the ecosystem is fundamental as it supports the food chain and oxygen production.
- Evolutionary implications involve understanding oxygenic photosynthesis versus anaerobic pathways in simpler organisms.
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Description
Explore the intricate processes of photosynthesis with this quiz based on Chapter 22. Learn about chloroplasts, light reactions, ATP production, and the evolutionary implications of photosynthesis. Test your understanding of CO2 fixation and how it varies in different plant types.
