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Photosynthesis and Chloroplasts

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Questions and Answers

What is the primary function of the thylakoid membranes in chloroplasts?

To catalyze the Calvin cycle reactions

To allow the diffusion of carbon dioxide into the chloroplast

To store ATP and NADPH produced during photosynthesis

To provide a site for the light reactions of photosynthesis (correct)

What is the overall chemical change that occurs during photosynthesis?

6 CO2 + 6 H2O → C6H12O6 + 6 O2

6 CO2 + 12 H2O + Light energy → C6H12O6 + 6 O2 (correct)

C6H12O6 + 6 O2 → 6 CO2 + 6 H2O

6 O2 + 12 H2O → C6H12O6 + 6 CO2

What is the role of chlorophyll in the light reactions of photosynthesis?

Chlorophyll acts as an electron acceptor, transferring electrons through the electron transport chain

Chlorophyll absorbs light energy and transfers it to the reaction centers of Photosystem I and Photosystem II (correct)

Chlorophyll splits water molecules, releasing hydrogen and oxygen as byproducts

Chlorophyll catalyzes the Calvin cycle reactions, converting CO2 into organic molecules

What is the purpose of the Calvin cycle in the overall process of photosynthesis?

To convert carbon dioxide into organic molecules, such as glucose Signup and view all the answers

What is the role of the electron transport chain in the light reactions of photosynthesis?

To transport electrons from the primary electron acceptor to Photosystem I Signup and view all the answers

What is the primary purpose of the electron transport chain in the light reactions of photosynthesis?

To reduce NADP+ to NADPH Signup and view all the answers

What is the purpose of the thylakoid space in the chloroplast?

To accumulate the hydrogen ions (H+) released during the splitting of water Signup and view all the answers

What is the role of the proton gradient created across the thylakoid membrane during the light reactions?

It drives the production of ATP through chemiosmosis Signup and view all the answers

Which of the following is a correct statement about the Calvin cycle?

It uses the energy of ATP and the reducing power of NADPH to reduce CO2 to sugar Signup and view all the answers

What is the purpose of the three phases of the Calvin cycle (carbon fixation, reduction, and regeneration of the CO2 acceptor)?

To convert CO2 into organic compounds and regenerate the starting material Signup and view all the answers

How many molecules of CO2 must be fixed in the Calvin cycle to produce one molecule of glyceraldehyde 3-phosphate (G3P)?

3 Signup and view all the answers

What is the role of the enzyme rubisco in the Calvin cycle?

It catalyzes the fixation of CO2 to RuBP Signup and view all the answers