Classwork: Photosynthesis, cellular respiration and fermentation
Name Ana Sofia Lozano
ID A01194526
Instructions: Answer the following questions using animations, power points and
your textbook on chapters 6, 7 and 8.
1. Explain the importance of energy for cellular function (What is energy
used for in the cell?).
 The cell utilizes energy for growth, division, carrying out biochemical
reactions and generally for performing all its functions.
2. Draw and label a molecule of ATP.
3. Describe the function of ATP.
 It transfers energy (in form of electrons) and helps starting
assimilation processes in the body
4. Write the overall reaction for photosynthesis.
 The overall chemical reaction involved in photosynthesis is:
5. Describe the phases of photosynthesis by filling in the following chart.
Light phase (light
dependent reaction)
Dark phase (light
independent reaction
or Calvin cycle)
Where does it happen
in the chloroplast?
Thylakoids
Stroma
Is light energy
needed?
Yes, light energy is
needed
No, light is not needed
What captures light
energy?
Chlorophyll is what
captures the light
energy
What are the main
starting reactants?
H2O, NADPH, ATP
Co2, NADP, ADP+P
What are the final
products?
O2
Glucose
Why is this phase
important?
This phase is important
because it captures
the light energy and
transform into
chemical energy in the
form of ATP and NADPH
It is the utilization of the
energy rich ATP and
NADPH molecules
formed in the light
dependent phase of
photosynthesis for the
production of energy
rich carbohydrates.
Stages of
photosynthesis
6. Write the overall reaction for cellular respiration.
 It is the reverse reaction of photosynthesis, but chemically, the steps
involved are very different.
7. Write the overall reaction for lactate fermentation and mention in what
cells it takes place.

Sugar (glucose)
Lactic Acid + Carbon Dioxide + Energy (ATP)
C6H12O6
2C3H6O3 + 2ATP

The lactate fermentation takes place on the cytoplasm of muscle
cells, or on lactic acid bacteria cells such as lactobacillus.
8. Write the overall reaction for alcohol fermentation and mention in what
cells it takes place.
 Sugar (glucose or fructose)
alcohol (ethanol) + carbon
dioxide
C6H12O6
2 CH3CH2OH + 2 CO2

It occurs in yeast and bacteria, but also in oxygen-starved muscle
cells.
9. Compare fermentation and cellular respiration by filling in the chart
Characteristics
Lactate
Fermentation
Alcohol
Fermentation
Cellular
Respiration
Main reactant or
reactants at the
beginning in the first
phase
Pyruvic Acid
and NADH
Glucose and
NADH
Glucose, water
and oxygen
Final Products at the
end of the
completion of all
their phases
Lactic acid
Alcohol and
carbon
dioxide
Carbon dioxide,
water and
energy
Final Energy Output
after the completion
of all their phases
Two ATPS
Two ATPS
36 and 38 ATPS
Places where it
occur specifically in
Cytoplasm of
muscle cells
Yeast,
bacteria and
It takes place on
the
the cell
and lactic acid
bacteria cells
muscle cells
mitochondria,
located in the
cells.
10. Describe how fermentation is different from cellular respiration.
 Fermentation is a type of cellular respiration but the main difference is
that fermentation doesn’t require oxygen to produce ATP.
Fermentation only uses glycolysis.
References:
http://www.icr.org/article/glycolysis-alcoholic-fermentation/
http://www.bio.umass.edu/biology/conn.river/light.html
http://www.biology.iupui.edu/biocourses/N100/2k4ch7respirationnotes.html
http://www.uic.edu/classes/bios/bios100/lecturesf04am/lect10.htm