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Questions and Answers
In which part of the chloroplast do the light-dependent reactions take place?
In which part of the chloroplast do the light-dependent reactions take place?
- Thylakoid membranes (correct)
- Chloroplast envelope
- Nucleoid
- Stroma
What is the primary function of the light-dependent reactions in photosynthesis?
What is the primary function of the light-dependent reactions in photosynthesis?
- To release oxygen as a byproduct
- To generate ATP and NADPH (correct)
- To convert CO2 into glucose
- To synthesize RuBP
What is the net result of the energy conversion process in photosynthesis?
What is the net result of the energy conversion process in photosynthesis?
- Light energy is converted into heat energy
- Chemical energy is converted into light energy
- Light energy is converted into chemical energy stored in glucose (correct)
- Chemical energy is converted into kinetic energy
What is the energy source for the light-independent reactions (Calvin Cycle)?
What is the energy source for the light-independent reactions (Calvin Cycle)?
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What is the role of RuBisCO in the light-independent reactions (Calvin Cycle)?
What is the role of RuBisCO in the light-independent reactions (Calvin Cycle)?
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Study Notes
Energy Conversion in Photosynthesis
Light-Dependent Reactions
- Occur in the thylakoid membranes of chloroplasts
- Light energy from the sun is absorbed by pigments (chlorophyll and others)
- Energy is used to generate ATP and NADPH
- Two stages:
- Light absorption and electron transfer
- ATP synthesis and reduction of NADP+
Light-Independent Reactions (Calvin Cycle)
- Occur in the stroma of chloroplasts
- Use energy from ATP and NADPH produced in light-dependent reactions
- Fix CO2 into organic molecules (glucose) using the enzyme RuBisCO
- Regenerate RuBP (ribulose-1,5-bisphosphate) to continue the cycle
Energy Conversion Summary
- Light energy is converted into chemical energy (ATP and NADPH) in light-dependent reactions
- Chemical energy is used to convert CO2 into glucose in light-independent reactions
- Net result: light energy is converted into chemical energy stored in glucose
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