Multiple Choice
Which of the following best describes what happens during the Calvin cycle of photosynthesis?
16
views
9. Photosynthesis
Calvin Cycle
Struggling with General Biology?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many phases does the Calvin cycle consist of?
A
One
B
Four
C
Two
D
Three
Verified step by step guidance1
Understand that the Calvin cycle is a series of biochemical reactions that occur in the stroma of chloroplasts during photosynthesis. It is also known as the light-independent reactions or dark reactions.
Learn that the Calvin cycle consists of three distinct phases: carbon fixation, reduction, and regeneration of RuBP (ribulose-1,5-bisphosphate).
In the carbon fixation phase, CO₂ is incorporated into a 5-carbon sugar called RuBP, forming a 6-carbon intermediate that quickly splits into two 3-carbon molecules called 3-phosphoglycerate (3-PGA).
In the reduction phase, ATP and NADPH (produced during the light-dependent reactions) are used to convert 3-PGA into glyceraldehyde-3-phosphate (G3P), a 3-carbon sugar.
In the regeneration phase, some G3P molecules are used to regenerate RuBP, allowing the cycle to continue. This regeneration requires ATP and ensures that the cycle can proceed repeatedly.
Related Videos
Related Practice
