Multiple Choice
Why does the Calvin cycle require light?
12. Photosynthesis
Light Independent Reactions
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What is the function of RUBISCO in carbon fixation?
A
Catalyzes carbon fixation
B
Convert carbon into starch
C
Promoting gas exchange
D
Opening and closing the stroma
Verified step by step guidance1
Understand that RUBISCO stands for Ribulose-1,5-bisphosphate carboxylase/oxygenase, which is an enzyme involved in the Calvin cycle of photosynthesis.
Recognize that the primary function of RUBISCO is to catalyze the first major step of carbon fixation, where it facilitates the reaction between carbon dioxide (CO2) and ribulose-1,5-bisphosphate (RuBP).
Note that this reaction results in the formation of two molecules of 3-phosphoglycerate (3-PGA), which are then used in subsequent steps of the Calvin cycle to eventually produce glucose and other carbohydrates.
Understand that while RUBISCO is crucial for carbon fixation, it does not directly convert carbon into starch. Starch synthesis occurs later in the photosynthetic process, using the glucose produced from the Calvin cycle.
Clarify that RUBISCO does not promote gas exchange or control the opening and closing of stomata; these functions are related to other plant structures and processes, such as guard cells and stomatal regulation.
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