The Calvin Cycle

Student Worksheet

The Calvin Cycle

LSM 3.3-3

Label the diagram of the Calvin cycle and fill in the blanks of the summary.

3

carbon

phosphate

Three molecules of

combine with

with the help of the

enzyme

. This forms an unstable intermediary

compound that splits to form six molecules of

. These molecules combine

with

groups from

to form

.

3

3 3

2 2

5

The

molecule released from

the Calvin cycle is used to form

. This can be stored as 1

molecules.

82 Chapter 3 Photosynthesis

6 6 6

6

6 6 6

6

is reduced using

to form

. One

molecule of

leaves the cycle as a final product,

while the other five molecules continue through the Calvin

cycle. The five molecules go through a series of reactions

to become

, which is then used to fix more

.

Copyright ? 2003 Nelson

Student Worksheet Solutions

The Calvin Cycle, Solution

LSM 3.3-4

Label the diagram of the Calvin cycle and fill in the blanks of the summary.

carbon

phosphate

3 CO2 3H2O

Three molecules of carbon dioxide combine with ribulose bisphosphate (RuBP) with the help of the

enzyme rubisco . This forms an unstable intermediary

compound that splits to form six molecules of 3-phosphoglycerate (PGA) . These molecules combine

with phosphate groups from ATP to form 1, 3-bisphosphoglycerate .

RuBP 3

3 ADP 3 ATP

2 2 H2O

5 G3P

PGA 6

6 ATP 6 ADP

6

6 NADPH

6 NADP+

6

Pi

6

G3P

The G3P molecule released from

the Calvin cycle is used to form glucose . This can be stored as starch molecules.

1 G3P

glucose

1, 3-bisphosphoglycerate is reduced using NADPH to form glyceraldehyde 3-phosphate (G3P) . One molecule of G3P leaves the cycle as a final product,

while the other five molecules continue through the Calvin

cycle. The five molecules go through a series of reactions to become RuBP , which is then used to fix more

carbon dioxide .

Copyright ? 2003 Nelson

Chapter 3 Photosynthesis 83

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