14. Which of the following best describes the function of the cytochrome bof com

Question

14. Which of the following best describes the function of the cytochrome bof complex in the thyakoid membranes? a. It produces ATP by chemiosmosis. b. It produces ATP by substrate-level phosphorylation. c. It produces NADPH by transferring electrons from ferredoxin. d. It transfers electrons from plastoquinol to plastocyanin. e. It oxidizes water and reduces plastoquinone. 15. Calvin and Benson discovered that when algal cells are exposed to 14CO2 in the light, the first compound that is labeled with radioactivity has carbon atoms. a. 2 b. 3 C. 4 d. 5 e. 6 6. The enzyme Rubisco has all of the following properties EXCEPT a. binds CO2 b. binds 02 c. binds ribulose 1,5-bisphosphate (RuBP) d. uses ATP e. forms 3-phosphoglycerate (3-PGA)

Explanation / Answer

14 Ans D; Cytochrome b6f complex found on both stacked andunstcked thylakoid membrane. it transfer the electrons from Plastoquinone to the pllastocyanin.

plastoquinone: is mobile electron carrier found between photosystem II and cytochrome b6f.

Plastocyanin: it is a copper (Cu) containing mobile electron carrier found between cytochrome b6f and Photosystem I

15 Ans B: the first compound labeled with radioactivity has 3 carbon atoms. it is 3-phosphoglicericacid(3-PGA). it is the first producat in the calvin cycle.

16 Ans D: Rubisco (Ribulose bisphosphate corboxylase and Oxygenase) is the most abundant protein in the universe. it is found in the chloroplasts. it is important enzyme in the photosynthesis. in the presence of Rubisco enzyme the Ribulose 1,5 bisphosphate (RUBP) and CO2 fuse to form 3-phospoglycerate. this enzyme will not use ATP for this reaction. this enzyme have two types of activities. one is corboxylase activity and second one is oxygenase activity.

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