Photosynthesis Mechanisms Quiz

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Questions and Answers

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?

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?

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:

NADP+ Signup and view all the answers

Which of the following statements is NOT correct about the Calvin cycle?

One PGA molecule is gained with every three turns of the cycle. Signup and view all the answers

With cyclic photophosphorylation:

ATP synthesis occurs by chemiosmosis. Signup and view all the answers

When photosystem II loses electrons during the light reactions, it gains its lost electrons from:

H₂O Signup and view all the answers

CAM and C4 pathways occur at different times and locations. C3 and C4 pathways occur at different:

Times of day; locations within the leaf Signup and view all the answers

The word 'photophosphorylation' implies:

Light is involved and ADP is phosphorylated. Signup and view all the answers

If the sun suddenly stopped emitting 'green' wavelengths of light:

Accessory pigments would harvest less light energy. Signup and view all the answers

On a dry day, lack of water can limit photosynthesis because:

Stomata will close, preventing CO₂ uptake. Signup and view all the answers

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?

3 Signup and view all the answers

Which statement about carbohydrate biosynthesis during the dark reactions of photosynthesis (i.e., the Calvin cycle reactions) is NOT TRUE?

The reactions occur in the photosynthetic membranes of chloroplasts. Signup and view all the answers

Which of the following does NOT occur during the dark reaction of photosynthesis?

Reduction of oxygen to produce water Signup and view all the answers

What is a property of C4 plants, but not C3 plants?

Initially fix carbon dioxide in mesophyll cells as 4-carbon long compounds. Signup and view all the answers

Which statement about photosynthesis in C4 plants is NOT true?

Less ATP is utilized in the C4 pathway compared to the C3 pathway. Signup and view all the answers

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.