Classwork: Photosynthesis, cellular respiration and fermentation
Name Marcela Medina ID A01194319
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?).
-Organisms and cells need constant energy so they carry out metabolic activities in order
to get it and maintain organization.
2. Draw and label a molecule of ATP.
Phosphates: (blue)
Adenine: (red)
Ribose: (pink)
3. Describe the function of ATP.
-ATP is a form of energy. Energy is stored in its bonds and then it releases
into the cells when it’s needed.
4. Write the overall reaction for photosynthesis.
-Photosynthesis: converts solar energy into chemical energy. It takes place in the
chloroplasts of plants. Glucose and oxygen are the products of photosynthesis.
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?
Happens in the thylakoid
Happens in the stroma
Is light energy needed?
Yes,
It is not needed
What captures light
energy?
Energy (ATP)
What are the main
starting reactants?
Sunlight and H2O (water)
NADPH, CO2, ATP
What are the final
products?
ATP, and NADPH, O2
(oxygen)
ADP + Pi, NADP, G3P
(glyceraldehyde 3)
Why is this phase
important?
It is important because it
produces oxygen and
It is important because it
converts CO2
Stages of photosynthesis
6. Write the overall reaction for cellular respiration.
-O2 + C6 H12 O6 --- energy + H2O + Co2
Write the overall reaction for lactate fermentation and mention in what cells it takes place.
-C6H12O6 + 2 NAD+ + 2 ADP + 2 Pi > 2 CH3COCOO- + 2 NADH + 2 ATP + 2 H2O + “H +
It tajes place in animal cells and muscle cells and bacteria
6. Write the overall reaction for alcohol fermentation and mention in what cells it takes
place.
-C6H12O6 + Zymase > 2 C2H5OH + 2 CO2
It takes place in the yeast
1. 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
glucose
glucose
O2 + C6 + O6
Final Products at the
end of the completion
of all their phases
2 lactase
2 alcohol and 2
CO2
Water and carbon
dioxide
Final Energy Output
after the completion of
all their phases
4 ATPs
4 ATPs
Energy 36 and
ATPs
Places where it occur
specifically in the cell
cytoplasm
cytoplasm
mitochondria
2. Describe how fermentation is different from cellular respiration.
Fermentation doesn’t require oxygen to produce ATP