AP BIOLOGY

PHOTOSYNTHESIS

THE CALVIN CYCLE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What happens to the majority of the G3P molecules in the last step of the dark reactions?
A
They are used to make glucose.
B
They are reshuffled to make CO2 by adding ATP.
C
They exit the cycle.
D
They are reshuffled to make RuBP by adding ATP.
Explanation: 

Detailed explanation-1: -What happens to the remaining G3P molecules in the last step of the dark reactions? They are used to make glucose. They are reshuffled to make CO2 by adding ATP.

Detailed explanation-2: -The third and final stage of the Calvin cycle is the regeneration of RuBP. Most of the G3P molecules produced in the previous step. More ATP is used to recycle the G3P and produce RuBP that will be used in carbon fixation, allowing the cycle to continue.

Detailed explanation-3: -Regeneration. One G3P molecule leaves the cycle and will go towards making glucose, while five G3Ps must be recycled to regenerate the RuBP acceptor. Regeneration involves a complex series of reactions and requires ATP.

Detailed explanation-4: -Glucose is the end product of the dark reaction.

There is 1 question to complete.