Refer to the Graph Below Summarizing Results from Experiments on Lysed

question 99

Multiple Choice

Refer to the graph below summarizing results from experiments on lysed chloroplasts.These are chloroplasts that have been isolated from green plant cells and then broken open to release all of the chloroplast contents into a mixture in a test tube.The mixture contained rubisco enzymes that were tested for their level of catalytic activity under the four conditions shown in the graph.DCMU is an organic molecule that inhibits the photosystem II electron transport chain. Which statement about photosynthesis is supported by the data presented in the graph?

• A) Rubisco undergoes activation in response to light and involves a mechanism mediated by electron transport.
• B) The Calvin cycle reactions require energy input in the form of NADPH and ATP, which are generated using energy from light.
• C) Carbohydrates produced in photosynthesis are used to make other molecules, including amino acids, lipids, and the building blocks of nucleic acids.
• D) The initial reaction in the Calvin cycle adds the carbon in CO₂ to ribulose 1,5-bisphosphate (RuB
• P).
• E) ATP synthase couples the formation of ATP to the movement of protons from a position of high concentration to a position of low concentration.

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