1
Photosystem II is most efficient at capturing light at which wavelength?
A. 700 nm
B. 670 nm
C. 690 nm
D. 680 nm
D. 680 nm
It holds a special pair of chlorophyll a molecules and primary electron acceptor.
A. Thylakoid stroma
B. Thylakoid lumen
C. Light-harvesting complex
D. Reaction-center complex
D. Reaction-center complex
Which enzyme is responsible for the final step of the light reactions, creating NADPH?
A. ATP Synthase
B. Cytochrome Complex
C. NADP+ Reductase
D. RuBisCO
C. NADP+ Reductase
Unlike linear electron flow, Cyclic Electron Flow bypasses Photosystem II and does NOT produce this specific high-energy electron carrier needed for the Calvin Cycle.
A. ATP
B. G3P
C. NADPH
D. Plastocyanin
C. NADPH
This process occurring at Photosystem II involves the splitting of water molecules to replace “lost” electrons, releasing oxygen as a byproduct.
A. Photorespiration
B. Photolysis
C. Chemiosmosis
D. Carbon Fixation
B. Photolysis
While the Calvin Cycle occurs in the fluid stroma, the Light-Dependent reactions take place specifically within these pancake-like “stacks” of membranes.
A. Cristae
B. Granum
C. Cytosol
D. Matrix
B. Granum
Which molecule is responsible for carrying electrons between the Cytochrome complex and Photosystem I?
A. Plastoquinone
B. Plastocyanin
C. Ferredoxin
D. Rubsico
B. Plastocyanin
A scientist punctures the thylakoid membrane, allowing molecules to move freely between the lumen and stroma. Light still shines, chlorophyll absorbs photons, and water is split at Photosystem II. Yet, the plant quickly dies.
What is the most likely cause?
A. Electrons from water splitting leak into the cytoplasm.
B. Oxygen escapes too quickly, disrupting respiration.
C. Protons (H⁺) leak, preventing the gradient needed for ATP synthase.
D. Chlorophyll detaches and can no longer absorb light.
C. Protons (H⁺) leak, preventing the gradient needed for ATP synthase.
MORSE TYPE
In linear electron flow, Ferredoxin receives high-energy electrons from the primary electron acceptor of Photosystem I and remains in the thylakoid membrane to pump additional protons. The enzyme NADP+ reductase then facilitates the transfer of these electrons from Ferredoxin to NADP+.
A. The first statement is correct; the second statement is wrong.
B. The first statement is wrong; the second statement is correct.
C. Both statements are correct.
D. Both statements are wrong.
B. The first statement is wrong; the second statement is correct.
A mutant plant possesses a Cytochrome complex that successfully transfers electrons from Plastoquinone to Plastocyanin but is incapable of performing the active pumping of hydrogen ions from the stroma into the lumen. Which of the following best predicts the impact on the Calvin Cycle?
A. The Calvin Cycle will accelerate as the absence of the active pumping of hydrogen ions allows electrons to move faster through the transport chain to Photosystem I
B. The Calvin Cycle will stall because the lack of a proton gradient prevents the reduction of NADP+ to NADPH
C. The Calvin Cycle will continue normally because the protons released by photolysis provide enough proton motive force for all required ATP synthesis
D. The Calvin Cycle will stall because the reduced PMF results in an ATP supply that is insufficient to meet the ATP to NADPH requirement
D. The Calvin Cycle will stall because the reduced PMF results in an ATP supply that is insufficient to meet the ATP to NADPH requirement