Multiple Choice
Why is water an essential ingredient for photosynthesis in organic chemistry?
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Intro to Organic Chemistry
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Why is the Calvin cycle also known as C3 photosynthesis?
A
Because it involves three different types of chlorophyll.
B
Because it occurs in three distinct stages.
C
Because it requires three molecules of ATP for each cycle.
D
Because it produces a three-carbon compound as the first stable product.
Verified step by step guidance1
Understand that the Calvin cycle is a part of photosynthesis that occurs in the stroma of chloroplasts, where it uses ATP and NADPH to convert CO2 into glucose.
Recognize that the Calvin cycle is also known as C3 photosynthesis because the first stable product formed is a three-carbon compound, 3-phosphoglycerate (3-PGA).
The cycle begins with the fixation of CO2 by the enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO), which catalyzes the reaction between CO2 and ribulose-1,5-bisphosphate (RuBP) to form an unstable six-carbon intermediate.
This unstable intermediate quickly splits into two molecules of 3-phosphoglycerate (3-PGA), each containing three carbon atoms, hence the name C3 photosynthesis.
The 3-PGA molecules are then used in subsequent reactions of the Calvin cycle to eventually produce glucose, with the help of ATP and NADPH generated during the light-dependent reactions of photosynthesis.
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