40-43 During CO_2 fixation, CO_2 combines with A) NADPH B) 3PG C) G3P D) water E

Question

40-43

During CO_2 fixation, CO_2 combines with A) NADPH B) 3PG C) G3P D) water E) Ribulose biphosphate (RuBP) In C_4 plants, the function of the four-carbon compound that is synthesized in the mesophyll cells is to A) reduce NADP^+ B) combine with CO_2 to produce glucose. C) carry CO_2 to the bundle sheath cells. D) drive the synthesis of ATP. E) close the stomata. The net energy outcome of cyclic photophosphorylation is A) ATP. B) ATP and NADH. C) NADPH. D) ATP and NADPH. E sugar. When is water used in photosynthesis? A) Photoevent 1 B) Photoevent 2 C) Dark reactions D) a and b

Explanation / Answer

(40) During CO2 fixation, CO2 combines with Ribulose biphosphate in the presence of enzyme Ribose-1,5 bIphosphate carboxylase and the product of this reaction is six carbon intermediate which immediately splits to form two molecules of 3-phosphoglycerate.

(41) It carry CO2 to the bundle sheath cell.

(42) only ATP is formed.because there is no electron acceptor so only photosystem 1 is invloved and only ATP is produced.

(43) water is used by photosystem 2.water is catalysed by light into hydrogen ion,electron and oxygen.

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