Yes, the Calvin cycle does require ATP for its functioning.
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NADPH is produced by the Calvin cycle through the light-dependent reactions of photosynthesis. ATP is also generated during the light-dependent reactions but is not directly produced by the Calvin cycle.
The Calvin cycle can occur in the dark because it does not directly require light to function. The light-dependent reactions that produce ATP and NADPH, which are needed for the Calvin cycle, can occur during the day and provide the energy and reducing power required for the cycle to proceed even in the absence of light.
The product of the light reactions of photosynthesis that is utilized in the Calvin cycle is ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate). These two molecules provide the energy and reducing power necessary for the Calvin cycle to convert carbon dioxide into sugars.
Yes, the process of endocytosis does require ATP for its functioning. ATP provides the energy needed for the cell to engulf and internalize substances through the cell membrane.
The two steps in photosynthesis are the light-dependent reactions, which occur in the thylakoid membranes and require light to produce ATP and NADPH, and the light-independent reactions (Calvin cycle) that occur in the stroma and use ATP and NADPH to convert CO2 into sugar.