The Krebs Cycle - Lake Washington Institute of Technology
[Pages:2]Student Worksheet
The Krebs Cycle
LSM 2.2-3
Fill in the molecules created or released during the Krebs cycle. Fill in the blanks of the summaries.
Pyruvate Oxidation
enters the mitochondrion from the cytoplasm.
One
atom is removed via
and
is removed using
.
becomes attached to the remaining
atoms,
creating
, which then enters the Krebs cycle.
CoA CoA? SH
Krebs Cycle
enters the cycle and then combines
with
to make the six-carbon compound
. During the eight steps of the Krebs cycle,
undergoes a number of reactions, releasing
and
in a number of steps.
is
eventually converted into
so it can be
used again during the Krebs cycle.
CoA? SH CoA? SH
Products of the Krebs Cycle
1.
is released as waste.
2.
and
move to the next stage of cellular respiration.
3. Energy is released in the form of
. A glucose molecule produces
molecules of
because two molecules of
are created from
each molecule of
.
Copyright ? 2003 Nelson
Chapter 2 Cellular Respiration 45
Student Worksheet Solutions
The Krebs Cycle, Solution
LSM 2.2-4
Fill in the molecules created or released during the Krebs cycle. Fill in the blanks of the summaries.
Pyruvate Oxidation Pyruvate enters the mitochondrion from the cytoplasm.
One carbon atom is removed via decarboxylation and hydrogen is removed using NAD+ . Coenzyme A
becomes attached to the remaining carbon atoms, creating acetyl ? CoA , which then enters the Krebs cycle.
NAD+
NADH
CO2
CoA
CoA? SH
Krebs Cycle Acetyl-CoA enters the cycle and then combines
with oxaloacetate to make the six-carbon compound citrate . During the eight steps of the Krebs cycle, citrate undergoes a number of reactions, releasing CO2 and ATP in a number of steps. Citrate is
eventually converted into oxaloacetate so it can be
used again during the Krebs cycle.
NADH NAD
CoA? SH CoA? SH
CO2 NAD+ NADH
CO2 NAD+ NADH
FADH2
FAD
GTP GDP
ADP + Pi
Products of the Krebs Cycle
ATP
1. CO2 is released as waste.
2. NADH and FADH 2 move to the next stage of cellular respiration.
3. Energy is released in the form of ATP . A glucose molecule produces two
molecules of ATP because two molecules of pyruvate are created from
each molecule of glucose .
46 Chapter 2 Cellular Respiration
Copyright ? 2003 Nelson
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