Multiple Choice
Which of the following incorrectly describes mechanisms of CO\(_2\) transport in plants during photosynthesis?
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9. Photosynthesis
Introduction to Photosynthesis
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Why is it necessary for 6 molecules of CO\(_2\) to enter the chloroplast during photosynthesis?
A
To generate six molecules of ATP
B
To produce one molecule of glucose (C\(_6\)H\(_{12}\)O\(_6\))
C
To release six molecules of oxygen (O\(_2\))
D
To initiate the light-dependent reactions
Verified step by step guidance1
Understand the role of CO\(_2\) in photosynthesis: CO\(_2\) is a key reactant in the Calvin cycle, which is part of the light-independent reactions of photosynthesis. It is used to build glucose molecules through a series of enzymatic reactions.
Recall the chemical formula for glucose: Glucose has the molecular formula C\(_6\)H\(_{12}\)O\(_6\), meaning it contains six carbon atoms. These carbon atoms come from six molecules of CO\(_2\) that are fixed during the Calvin cycle.
Recognize the stoichiometry of the Calvin cycle: Each turn of the Calvin cycle fixes one molecule of CO\(_2\). To produce one molecule of glucose, the cycle must turn six times, requiring six molecules of CO\(_2\).
Understand the relationship between CO\(_2\) and oxygen release: While six molecules of CO\(_2\) are used in the Calvin cycle, oxygen (O\(_2\)) is released during the light-dependent reactions as a byproduct of water splitting, not directly related to CO\(_2\) fixation.
Clarify the role of ATP: ATP is generated during the light-dependent reactions and used as an energy source in the Calvin cycle to drive the synthesis of glucose. However, the entry of six molecules of CO\(_2\) is specifically tied to the production of one molecule of glucose, not directly to ATP generation.
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