The Calvin Cycle

Question 1

The calvin cycle uses

Answer 1

NADPH and ATP to convert CO2 to sugar

Question 2

the calvin cycle regenerates its starting materials after

Answer 2

molecules enter and leave the cycle

Question 3

The cycle builds sugars from smaller molecules by

Answer 3

using ATP and the reducing power of electrons carried by NADPH

Question 4

Carbon enters the cycle as CO2 and leaves as

Answer 4

a sugar named glyceraldehyde-3-phosphate

Question 5

For net synthesis of G3P

Answer 5

the cycle must take place 3 times, fixing 3 molecules of CO2

Question 6

the calvin cycle has 3 phases

Answer 6

• Carbon fixation (catalyzed by rubisco)
• reduction
• regenertion of CO2 acceptor (RuBP)

Question 7

Dehydration is a problem for plants, sometimes requiring

Answer 7

trade-offs with other metabolic processes, especially photosynthesis

Question 8

On hot, dry days, plants close stomata which

Answer 8

conserves H2O but also limits photosynthesis

Question 9

the closing of stomata reduces

Answer 9

access to CO2 and causes O2 to build up. These conditions favor a seemingly wasteful process called photorespiration