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Photosynthesis Light Reactions Quiz

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Questions and Answers

What is the primary function of the light reaction in photosynthesis?

To fix carbon dioxide into organic molecules

To break down glucose for energy

To produce glucose from pyruvate

To convert light energy into chemical energy (correct)

Which molecule acts as the primary electron donor in the electron transport chain during the light reaction?

Water (correct)

Carbon Dioxide

NADPH

ATP

What is the role of ATP Synthase in the light reaction?

To produce glucose

To fix carbon dioxide

To generate ATP from a proton gradient (correct)

To reduce NADP+ to NADPH

Which step of the Calvin cycle involves the use of ATP and NADPH?

<p>USE of ATP & NADPH (A)</p> Signup and view all the answers

What is the ultimate goal of the Calvin cycle?

<p>To synthesize glucose from carbon dioxide (C)</p> Signup and view all the answers

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Flashcards

Light Reaction

The stage of photosynthesis that requires light, occurring in the thylakoid, producing ATP, NADPH, and O₂.

Calvin Cycle

Also known as the dark reaction, it takes place in the stroma and uses CO₂, ATP, and NADPH to synthesize glucose.

Photosystem II

The first protein complex in the light reaction, where electrons are excited by light energy.

Electron Transport Chain

A series of proteins in the thylakoid membrane that transfer excited electrons, leading to ATP and NADPH production.

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PGA Formation

A step in the Calvin Cycle where a six-carbon sugar splits into two 3-carbon PGA molecules.

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Study Notes

Photosynthesis

Light Reaction: Also known as light-dependent reaction, occurs in the thylakoid.
- Light, water (H₂O) → ATP, NADPH, oxygen (O₂).
- Pigments absorb light energy.
- Electrons use light energy to become excited and jump energy levels.
- Excited electrons enter the electron transport chain (a series of proteins).
- Photosystem II, hydrolysis, Photosystem I, creating NADPH, ATP Synthase produces ATP.

Dark Reaction

Also known as light-independent reaction or Calvin cycle, occurs in the stroma.
- Carbon dioxide (CO₂), ATP, NADPH → glucose, ADP, NADP⁺
- Carbon fixation: Carbon from CO₂ is added to a 5-carbon sugar.
- PGA formation: The unstable six-carbon sugar is split into two PGA molecules.
- Using ATP and NADPH from light reactions, PGA converts to PGAL.
- Glucose production: After six rounds of the Calvin cycle, two PGAL molecules leave the cycle to from glucose.
- ATP and PGAL replenish RuBP: Some PGAL molecules are recycled and reform RuBP using ATP.

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Description

Test your knowledge on the light reactions of photosynthesis! This quiz covers the primary functions, processes, and outcomes of the light-dependent reactions and the Calvin cycle. Perfect for students looking to deepen their understanding of plant biology.