Which molecule accepts CO2 in the Calvin cycle?

Prepare for the Foundations of Biology Exam 1. Dive into key biological concepts with multiple choice questions, hints, and explanations. Ace the exam with our efficient study methods!

Multiple Choice

Which molecule accepts CO2 in the Calvin cycle?

Explanation:
In carbon fixation, CO2 is captured by a five-carbon molecule called RuBP (ribulose-1,5-bisphosphate). The enzyme rubisco catalyzes the attachment of CO2 to RuBP, forming a six-carbon intermediate that immediately splits into two molecules of 3-phosphoglycerate. This makes RuBP the molecule that accepts CO2. The roles of ATP and NADPH come later in the cycle, providing energy and reducing power to convert 3-PGA into glyceraldehyde-3-phosphate and to regenerate RuBP. NADPH and ATP are carriers of electrons and energy, not CO2 acceptors.

In carbon fixation, CO2 is captured by a five-carbon molecule called RuBP (ribulose-1,5-bisphosphate). The enzyme rubisco catalyzes the attachment of CO2 to RuBP, forming a six-carbon intermediate that immediately splits into two molecules of 3-phosphoglycerate. This makes RuBP the molecule that accepts CO2. The roles of ATP and NADPH come later in the cycle, providing energy and reducing power to convert 3-PGA into glyceraldehyde-3-phosphate and to regenerate RuBP. NADPH and ATP are carriers of electrons and energy, not CO2 acceptors.

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