PHOTOSYNTHESIS
THE CALVIN CYCLE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
1
|
|
|
2
|
|
|
3
|
|
|
4
|
Detailed explanation-1: -For one turn: ATP used = 3 molecules NADPH used = 2 molecules Thus for six cycles : ATP used = 3*6 = 18 molecules NADPH used = 2*6 = 12 molecules Therefore total ATP and NADPH required to produce one molecule of glucose is 18 and 12 respectively. Q.
Detailed explanation-2: -It would take six turns of the cycle, or 6 CO2start text, C, O, end text, start subscript, 2, end subscript, 18 ATP, and 12 NADPH, to produce one molecule of glucose.
Detailed explanation-3: -Recall that a reduction is the gain of an electron by an atom or molecule. Six molecules of both ATP and NADPH are used. For ATP, energy is released with the loss of the terminal phosphate atom, converting it to ADP; for NADPH, both energy and a hydrogen atom are lost, converting it into NADP+.
Detailed explanation-4: -The C3 pathway requires 18 molecules of ATP for the synthesis of one molecule of glucose, whereas the C4 pathway requires 30 molecules of ATP.
Detailed explanation-5: -In summary, it takes six turns of the Calvin cycle to fix six carbon atoms from CO2. These six turns require energy input from 12 ATP molecules and 12 NADPH molecules in the reduction step and 6 ATP molecules in the regeneration step.