Podcast
Questions and Answers
Which of the following is NOT true of the Calvin cycle?
Which of the following is NOT true of the Calvin cycle?
- Sunlight energy is converted to chemical energy in the form of ATP and NADPH. (correct)
- PGA is reduced using ATP and NADPH.
- CO₂ reacts with RuBP to form 2 molecules of PGA.
- RuBP is regenerated.
Which of the following statements is NOT correct about ATP?
Which of the following statements is NOT correct about ATP?
- ATP is generated during the Calvin cycle. (correct)
- ATP is generated during both aerobic and anaerobic cell respiration.
- ATP is generated during the light reactions of photosynthesis.
- ATP is hydrolyzed during glycolysis.
Which of the following events does NOT occur during the light reactions of photosynthesis?
Which of the following events does NOT occur during the light reactions of photosynthesis?
- RuBP is regenerated using ATP (correct)
- NADPH is synthesized
- Oxygen gas is produced
- ATP is synthesized
During noncyclic photophosphorylation, water is oxidized and the electrons from water pass through photosystem II and photosystem I before reducing:
During noncyclic photophosphorylation, water is oxidized and the electrons from water pass through photosystem II and photosystem I before reducing:
Which of the following statements is NOT correct about the Calvin cycle?
Which of the following statements is NOT correct about the Calvin cycle?
With cyclic photophosphorylation:
With cyclic photophosphorylation:
When photosystem II loses electrons during the light reactions, it gains its lost electrons from:
When photosystem II loses electrons during the light reactions, it gains its lost electrons from:
CAM and C4 pathways occur at different times and locations. C3 and C4 pathways occur at different:
CAM and C4 pathways occur at different times and locations. C3 and C4 pathways occur at different:
The word 'photophosphorylation' implies:
The word 'photophosphorylation' implies:
If the sun suddenly stopped emitting 'green' wavelengths of light:
If the sun suddenly stopped emitting 'green' wavelengths of light:
On a dry day, lack of water can limit photosynthesis because:
On a dry day, lack of water can limit photosynthesis because:
As discovered by Calvin, when algal cells are exposed to radioactive carbon dioxide in the light for only 1 second, the compound that is most quickly and most extensively labeled with radioactive C has how many carbon atoms?
As discovered by Calvin, when algal cells are exposed to radioactive carbon dioxide in the light for only 1 second, the compound that is most quickly and most extensively labeled with radioactive C has how many carbon atoms?
Which statement about carbohydrate biosynthesis during the dark reactions of photosynthesis (i.e., the Calvin cycle reactions) is NOT TRUE?
Which statement about carbohydrate biosynthesis during the dark reactions of photosynthesis (i.e., the Calvin cycle reactions) is NOT TRUE?
Which of the following does NOT occur during the dark reaction of photosynthesis?
Which of the following does NOT occur during the dark reaction of photosynthesis?
What is a property of C4 plants, but not C3 plants?
What is a property of C4 plants, but not C3 plants?
Which statement about photosynthesis in C4 plants is NOT true?
Which statement about photosynthesis in C4 plants is NOT true?
Study Notes
Calvin Cycle
- CO₂ reacts with RuBP (ribulose bisphosphate) to form two molecules of PGA (phosphoglyceric acid).
- RuBP is regenerated.
- PGA is reduced using energy from ATP and NADPH.
### Light Reactions
- ATP is synthesized.
- Oxygen gas is produced.
- NADPH is synthesized.
Noncyclic Photophosphorylation
- Water is oxidized and the electrons from water pass through photosystem II and photosystem I before reducing NADP+ to NADPH.
ATP
- ATP is generated during:
- The light reactions of photosynthesis.
- Both aerobic and anaerobic cell respiration.
- ATP is hydrolyzed during glycolysis.
Calvin Cycle
- CO₂ is fixed by RuBP
- The reactions of the cycle occur in the stroma of mesophyll cells.
- Three carbon dioxide molecules are fixed in each turn of the cycle.
Cyclic Photophosphorylation
- ATP synthesis occurs by chemiosmosis.
Photosystem II
- Photosystem II gains its lost electrons from water.
C3 and C4 Pathways
- C3 and C4 pathways differ in their location within the leaf and the time of day they occur.
Photophosphorylation
- Light is involved and ADP is phosphorylated to make ATP(adenosine triphosphate).
### Accessory Pigments
- Accessory pigments are not directly involved in light absorption to form ATP.
Photosynthesis and Water
- Water must be split in the light reactions
- Stomata will close, preventing CO₂ uptake, limiting photosynthesis
- H⁺ ions are needed for ATP synthesis.
Calvin Cycle
- When algal cells are exposed to radioactive carbon dioxide in the light for only 1 second, the compound that is most quickly and most extensively labeled with radioactive C has three carbon atoms.
Dark Reactions
- The dark reactions occur in the stroma of chloroplasts.
Dark Reactions
- Oxygen is not required for the dark reactions.
C4 Plants
- C4 plants initially fix carbon dioxide in mesophyll cells as 4-carbon long compounds.
- C4 photosynthesis is an adaptation for plants living in hot, arid climates.
- Carbon dioxide is initially fixed in mesophyll cells, but the Calvin cycle is active bundle sheath cells in leaves of C4 plants.
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Description
Test your knowledge on the intricate processes of photosynthesis, including the Calvin Cycle and light reactions. This quiz covers essential concepts like ATP synthesis, photophosphorylation, and the key differences between C3 and C4 pathways.
