The Calvin Cycle - Chapter 23 Flashcards
1
Q
Is the Calvin cycle light dependent or independent?
A
independent - dark cycles
1
Q
What is the source of carbon in the Calvin cycle?
A
CO2
2
Q
Is the Calvin cycle an oxidizing or reducing process?
A
The Calvin cycle turns the oxidized CO2 into a more reduced state as a hexose.
3
Q
Where does the Calvin cycle take place?
A
in the stroma of the chloroplasts
4
Q
What are the stages of the Calvin cycle?
A
- Fixation of CO2 by ribulose 1,5-bisphosphate to form 2 molecules of 3-phosphoglycerate
- Reduction of 3-phosphoglycerates to form hexose sugars
- Regeneration of ribulose 1,5-bisphosphate
5
Q
How many times must the Calvin cycle occur to convert individual CO2 molecules into glucose?
A
6 times to make a hexose sugar.
6
Q
What is the rate-limiting step in hexose synthesis?
A
Fixation of CO2, catalyzed by rubisco (ribulose 1,5-bisphosphate carboxylase)
7
Q
A
