Podcast
Questions and Answers
What are the starting components for photosynthesis?
What are the starting components for photosynthesis?
- Sunlight and Chlorophyll
- Water and Carbon dioxide (correct)
- Sugar and Oxygen
- Oxygen and ATP
What does Photosystem 2 start with?
What does Photosystem 2 start with?
- Oxygen
- Water and sunlight (correct)
- NADPH
- ATP
What does Photosystem 1 produce?
What does Photosystem 1 produce?
- Glucose
- Water
- NADPH (correct)
- Oxygen and ATP
Photosystem 2 ends with oxygen and ATP.
Photosystem 2 ends with oxygen and ATP.
What process pulls hydrogen into the thylakoid against their concentration gradient in Photosystem 2?
What process pulls hydrogen into the thylakoid against their concentration gradient in Photosystem 2?
Photosynthesis takes place in the chloroplast.
Photosynthesis takes place in the chloroplast.
What molecules are produced during photosynthesis?
What molecules are produced during photosynthesis?
Why do plants use accessory pigments in photosynthesis?
Why do plants use accessory pigments in photosynthesis?
Photosystems 1 and 2 are ______ processes that pull energy from the sun.
Photosystems 1 and 2 are ______ processes that pull energy from the sun.
Where do the Calvin Cycle reactions occur?
Where do the Calvin Cycle reactions occur?
During photosystem 2, light hits a pigment in the thylakoid, passing ______ to another pigment until it reaches p680.
During photosystem 2, light hits a pigment in the thylakoid, passing ______ to another pigment until it reaches p680.
How is the electron from p680 replaced during photosystem 2?
How is the electron from p680 replaced during photosystem 2?
What happens to the electron from p700 in photosystem 1?
What happens to the electron from p700 in photosystem 1?
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Study Notes
Photosystem II
- Initiates the photosynthetic process with water and sunlight.
- Produces oxygen and ATP as end products.
- Occurs in thylakoid membranes of chloroplasts.
- Sunlight energy excites an electron within a pigment, starting the electron transport chain.
- Splits water molecules, releasing oxygen in the process.
- Utilizes active transport to pull hydrogen ions into the thylakoid against their concentration gradient.
- Energy transfer occurs as light hits the pigments, moving from one to another until reaching P680.
Photosystem I
- Utilizes energy from sunlight to synthesize NADPH.
- Aims to capture solar energy efficiently to create NADPH.
- Operates alongside Photosystem II, both are endergonic and draw energy from the sun.
- Receives an electron from Photosystem II to replenish its P700 electron.
Photosynthesis Overview
- Takes place in chloroplasts, specifically within thylakoids and stroma.
- Starting materials include water and carbon dioxide.
- Produces ATP and NADPH during the light-dependent reactions.
- The Calvin Cycle requires carbon dioxide and is driven by ATP and NADPH generated in Photosystems I and II.
Accessory Pigments
- Essential for maximizing light absorption, capturing wavelengths that chlorophyll cannot absorb.
Energy Transformation
- Solar energy converted into chemical energy stored in glucose, with some energy lost in the process.
- Process is efficient in harnessing energy to support plant growth and metabolism.
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