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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