AP BIOLOGY

Detailed explanation-1: -This reaction is considered a reduction because NADPH must donate its electrons to a three-carbon intermediate to make G3P. Regeneration. One G3P molecule leaves the cycle and will go towards making glucose, while five G3Ps must be recycled to regenerate the RuBP acceptor.

Detailed explanation-2: -Stage 3: Regeneration But each turn makes two G3Ps, thus three turns make six G3Ps. One is exported while the remaining five G3P molecules remain in the cycle and are used to regenerate RuBP, which enables the system to prepare for more CO2 to be fixed.

Detailed explanation-3: –In the first part of Phase 3, 5 molecules of G3P (1 phosphate group each) are converted to 3 molecules of R5P (also 1 phosphate group each). Thus there is a net release of 2 Pi.-In the second part of Phase 3, 3 ATP molecules are used to convert the 3 R5P into 3 RuBP.

Detailed explanation-4: -One of the three-carbon molecules of G3P leaves the cycle to become a part of a carbohydrate molecule. The remaining G3P molecules stay in the cycle to be formed back into RuBP, which is ready to react with more CO2. Photosynthesis forms a balanced energy cycle with the process of cellular respiration.

Detailed explanation-5: -One ATP is used in the regeneration of RuBP.