The Calvin Cycle

Question 1

How many ATP and NADPH molecules are required to synthesize one molecule of glucose in Calvin cycle?

Answer 1

18 ATP, 12 NADPH

Question 2

How many molecules of 3 – phosphoglycerate is synthesized from the reaction between 6CO2 and 6RuBP?

Answer 2

12

Question 3

How many ATP and NADPH molecules are used in the reduction phase to convert 3-phosphoglycerate to glyceraldehyde-3-phosphate?

Answer 3

12 ATP , 12 NADPH

Question 4

What enzyme is involved in CO2 fixation of Calvin cycle ?

Answer 4

RuBisCo

Question 5

How many ATP and NADPH is used for the regeneration of 6RuBp molecules?

Answer 5

6 ATP only

Question 6

The Calvin cycle is considered light-independent because it can occur in darkness. However, most often the Calvin cycle takes place in the sunlight. Which of the following likely explains why?

A. Sunlight is important in activating carbon fixation in the Calvin cycle.
B. The Calvin cycle requires ATP and NADPH , which require sunlight to be
produced.
C. The enzymes involved in the Calvin cycle are unable to bind substrates
in the dark.
D. RuBP regeneration requires sunlight in order to occur and continue the
Calvin cycle.

Answer 6

D. RuBP regeneration requires sunlight in order to occur and continue the
Calvin cycle.

Question 7

The light reactions of photosynthesis supply the Calvin cycle with:

Answer 7

ATP and NADPH

Question 8

Which of the following sequences correctly represents the flow of electrons during photosynthesis?

A. NADPH – O2 – CO2
B. H2O – NADPH – Calvin cycle
C. NADPH – chlorophyll – Calvin cycle
D. H2O – photosystem I – photosystem II

Answer 8

D. H2O – photosystem I – photosystem II

Question 9

In mechanism, photophosphorylation is most similar to:

A. Carbon fixation
B. the Calvin cycle
C. substrate – level phosphorylation in glycolysis
D. oxidative phosphorylation in cellular respiration

Answer 9

D. oxidative phosphorylation in cellular respiration