Multiple Choice
Which of the following is an input required for the Calvin cycle (light-independent reactions) in photosynthesis?
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9. Photosynthesis
Calvin Cycle
Multiple Choice
During photosynthesis, specifically by the end of the Calvin cycle, what are water (\(H_2O\)) and carbon dioxide (\(CO_2\)) primarily converted into?
A
Fatty acids
B
Oxygen gas (\(O_2\))
C
Glucose (\(C_6H_{12}O_6\))
D
Amino acids
Verified step by step guidance1
Understand the role of the Calvin cycle in photosynthesis: The Calvin cycle is the light-independent stage of photosynthesis where carbon fixation occurs, converting carbon dioxide (\(CO_2\)) into organic molecules.
Recognize the inputs and outputs of the Calvin cycle: The primary inputs are carbon dioxide (\(CO_2\)), ATP, and NADPH (produced during the light-dependent reactions). The main output is glucose (\(C_6H_{12}O_6\)), a simple sugar.
Identify the chemical transformations: Carbon dioxide (\(CO_2\)) is fixed into a 3-carbon molecule (3-phosphoglycerate) and subsequently converted into glucose (\(C_6H_{12}O_6\)) through a series of enzymatic reactions powered by ATP and NADPH.
Clarify the role of water (\(H_2O\)): Water is primarily involved in the light-dependent reactions of photosynthesis, where it is split to produce oxygen gas (\(O_2\)), electrons, and protons. However, by the end of the Calvin cycle, water does not directly contribute to the formation of glucose.
Conclude that the correct answer is glucose (\(C_6H_{12}O_6\)): Fatty acids and amino acids are not direct products of the Calvin cycle, and oxygen gas (\(O_2\)) is produced during the light-dependent reactions, not the Calvin cycle.
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