Podcast
Questions and Answers
What are the essential components used in photosynthesis to produce energy-storing sugars?
What are the essential components used in photosynthesis to produce energy-storing sugars?
- Light, O2, and organic matter
- CO2, H2O, and organic matter
- CO2, O2, and H2O
- Light, CO2, and H2O (correct)
What is the waste product generated during photosynthesis?
What is the waste product generated during photosynthesis?
- Organic matter
- Carbon dioxide
- Water
- Oxygen (correct)
What do autotrophs not need a supply of?
What do autotrophs not need a supply of?
- Light energy
- Inorganic molecules
- Organic carbon (correct)
- Water
What do heterotrophs need in order to survive?
What do heterotrophs need in order to survive?
What ultimately produces the organic matter that animals 'feed' on?
What ultimately produces the organic matter that animals 'feed' on?
What provides the bulk of the energy for the majority of the ecosystems on earth?
What provides the bulk of the energy for the majority of the ecosystems on earth?
Which process involves oxygen production and CO2 fixation?
Which process involves oxygen production and CO2 fixation?
What is the primary function of the Calvin cycle in photosynthesis?
What is the primary function of the Calvin cycle in photosynthesis?
What provides the electrons for the reduction of CO2 to carbohydrate in photosynthesis?
What provides the electrons for the reduction of CO2 to carbohydrate in photosynthesis?
Where is chlorophyll a present in organisms performing plant-type photosynthesis?
Where is chlorophyll a present in organisms performing plant-type photosynthesis?
What is the site of photosynthesis in plants?
What is the site of photosynthesis in plants?
What is the major product of photosynthesis?
What is the major product of photosynthesis?
What is the primary function of the enzyme RuBisco in photosynthesis?
What is the primary function of the enzyme RuBisco in photosynthesis?
What is the role of NADPH and ATP in photosynthesis?
What is the role of NADPH and ATP in photosynthesis?
What is the function of starch in photosynthesis?
What is the function of starch in photosynthesis?
What is the difference between the photosynthetic and respiratory electron transport chains (PS ETC and RS ETC)?
What is the difference between the photosynthetic and respiratory electron transport chains (PS ETC and RS ETC)?
What is the product of the respiratory electron transport chain (RS ETC)?
What is the product of the respiratory electron transport chain (RS ETC)?
What is the function of sucrose in plants?
What is the function of sucrose in plants?
What is the role of the light reactions in photosynthesis?
What is the role of the light reactions in photosynthesis?
What is the primary function of ATP synthase in the thylakoid membrane during light reactions?
What is the primary function of ATP synthase in the thylakoid membrane during light reactions?
What is the role of the oxygen-evolving complex (OEC) in Photosystem II (PSII)?
What is the role of the oxygen-evolving complex (OEC) in Photosystem II (PSII)?
What is the function of the thylakoids in photosynthesis?
What is the function of the thylakoids in photosynthesis?
What is the main product of the water-splitting reaction catalyzed by Photosystem II (PSII)?
What is the main product of the water-splitting reaction catalyzed by Photosystem II (PSII)?
What is the function of Photosystem I (PSI) in the light reactions of photosynthesis?
What is the function of Photosystem I (PSI) in the light reactions of photosynthesis?
What is the range of photosynthetically active radiation (PAR) in terms of wavelength?
What is the range of photosynthetically active radiation (PAR) in terms of wavelength?
What is the primary function of Rubisco in the Calvin cycle?
What is the primary function of Rubisco in the Calvin cycle?
What is the role of sucrose in plants?
What is the role of sucrose in plants?
What is the difference between the photosynthetic and respiratory electron transport chains (PS ETC and RS ETC)?
What is the difference between the photosynthetic and respiratory electron transport chains (PS ETC and RS ETC)?
What is the function of starch in photosynthesis?
What is the function of starch in photosynthesis?
What is the main product of the water-splitting reaction catalyzed by Photosystem II (PSII)?
What is the main product of the water-splitting reaction catalyzed by Photosystem II (PSII)?
What is the primary function of the light reactions in photosynthesis?
What is the primary function of the light reactions in photosynthesis?
What provides the bulk of the energy for the majority of the ecosystems on earth?
What provides the bulk of the energy for the majority of the ecosystems on earth?
What is the role of NADPH and ATP in photosynthesis?
What is the role of NADPH and ATP in photosynthesis?
What is the site of photosynthesis in plants?
What is the site of photosynthesis in plants?
What is the role of the oxygen-evolving complex (OEC) in Photosystem II (PSII)?
What is the role of the oxygen-evolving complex (OEC) in Photosystem II (PSII)?
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Study Notes
Photosynthesis and Light Reactions: Key Concepts
- Photosynthetically active radiation (PAR) ranges from 400 – 700 nm, similar to the visible spectrum for humans
- Photosynthetic pigments like chlorophyll and carotenoids absorb photons for photosynthesis
- The absorption process involves a transition from the ground state to the excited state and subsequent energy transfer
- Thylakoids contain chlorophyll and carotenoids and are the site of photon absorption and energy transfer
- Photosystems organize pigments for light harvesting and funnel absorbed photons to reaction center chlorophyll
- Photosystem II (PSII) contains an oxygen-evolving complex (OEC) that catalyzes the water-splitting reaction
- The water-splitting reaction produces low energy electrons (LEEs), H+ ions, and oxygen
- Photosystem I (PSI) converts photon energy to energize NADPH, a high energy electron carrier
- ATP synthase in the thylakoid membrane regenerates ATP using the electrochemical proton gradient
- The movement of proton gradient from lumen to stroma is essential for ATP regeneration
- Light reactions convert photon energy into the chemical potential energy of ATP and NADPH
- The Calvin cycle in the stroma uses ATP and NADPH to convert CO2 into 3C sugars
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