Name:
-Photosynthesis notes
-Photosynthesis Leaf Disk Lab
Cell Energy Exam Study Guide
Study the following:
-Cellular Respiration notes
-
1. Fill in the appropriate information for each row.
Type of cell(s) it occurs
in? (Plant, animal, and/or
bacterial?)
Where in the cell does it
occur?
Purpose of the process?
(Why does it occur in the
cell?)
Photosynthesis
Plant, algae & some bacteria
Cellular Respiration
All cells
Chloroplast..
Light-dependent: Thylakoids
Light-Independent: Stroma
To transfer energy from the sun
into glucose; to store energy; to
make food
Glycolysis: Cytoplasm
Krebs: Matrix of Mitochondria
ETC: Inner membrane of
mitochondria
To transfer energy from glucose
into a usable form for the cell
(ATP)
6CO2 + 6H2O
C6H12O6 + 6O2
C6H12O6 + 6O2
6CO2 + 6H2O
Yes
No
No
Yes
Light → Chemical Potential
Chemical Potential  Chemical
Potential
Reactants involved?
Products produced?
Removes carbon dioxide
from the atmosphere (yes
or no?)
Adds carbon dioxide to
the atmosphere (yes or
no?)
Overall energy
transformation from
beginning to end?
2. Based on the table above, write each term or statement in the correct part of the Venn diagram below.
Photo. only: 6CO2 + 6H2O → C6H12O6 + 6O2 Occurs in chloroplasts Utilizes chlorophyll
Produces oxygen
Sunlight → Chemical
Cell Resp. only: Occurs in animal cells Occurs in Mitochondria Produces carbon dioxide C6H12O6 + 6O2 → 6CO2 +
6H2O + Energy
Both CR & Photo: Occurs in plant cells, transfers energy for the cell
Photosynthesis
Cellular
Respiration
3. Some people claim talking to plants can make them grow better. Given what you know about
photosynthesis and respiration, why might a person talking/breathing very close to plant have an impact on
its growth?
When we breathe out, we are releasing carbon dioxide, which is a waste product from cellular respiration. Plants
require carbon dioxide to go through photosynthesis, a process necessary for their survival in which they make their
own food. Talking to plants provides them with carbon dioxide.
4. If plants produce oxygen as a result of photosynthesis, why aren’t oxygen levels continually increasing in the
atmosphere?
Organisms that go through aerobic cellular respiration take oxygen back out of the atmosphere.
5. Fill in the following chart about the stages of photosynthesis.
Stage name
Location in cell
Goes In
Comes Out (Produced)
Light-dependent
Chloroplast - Thylakoid
6H2O, light
NADPH, ATP, 6O2
Light-independent
Chloroplast- Stroma
6CO2, NADPH, ATP
C6H12O6, NADP+, ADP
6. Fill in the following chart about the stages of cellular respiration.
Comes Out
Stage
Location in cell
Goes In
(Produced)
Glycolysis
Cytoplasm
Krebs Cycle
Matrix of
Mitochondria
ETC
Inner membrane of
mitochondria
Type of cell that can use
this process
C6H12O6
2 pyruvate, 2 net
ATP, NADH
Prokaryotic &
Eukaryotic
2 pyruvate
6CO2, 2 ATP, NADH,
FADH2
Eukaryotic
NADH, FADH2, 6O2
6H2O, 32 ATP,
NAD+, FADH
Eukaryotic
7. Explain the difference between chloroplasts and chlorophyll.
The chloroplast is the ORGANELLE in which photosynthesis takes place. Chlorophyll is a pigment INSIDE
the chloroplast that absorbs the light energy for photosynthesis.
8. What is fermentation? Why does it occur? Describe each type of fermentation and identify which type
of organisms each type takes place in.
Fermentation is an anerobic process that allows glycolysis to continue making ATP in the absence of
oxygen or mitochondria (prokaryotes).
Lactic Acid - Takes place is some bacteria and animals, including human muscle cells when more oxygen
is being used than is being taken in. Produces lactic acid and 2 net ATP.
Alcoholic – takes place in bacteria and some yeast. Produces carbon dioxide, ethyl alcohol, and 2 net ATP.
9. Identify 3 factors that can affect the rate of photosynthesis, and explain how the rate of photosynthesis
changes as each of these factors is increased.
CO2 concentration: as it is increased, rate of photosynthesis increases until it eventually levels off.
Light intensity: as it is increased, rate of photosynthesis increases until it eventually levels off.
Temperature: as it is increased, rate of photosynthesis increases until it eventually peaks. At this point, it
will begin to decrease again as temperature is increased further.
10. Explain why the results in the yeast lab turned out the way they did – why was there no cellular
respiration in the flask with no yeast? Why was there more cellular respiration in the flask with sugar
than in the flask with flour?
Flask 1: No yeast – no living thing (no cells) to go through cellular respiration so there was no carbon
dioxide produced.
Flask 2: Yeast with no flour or sugar – there was no glucose for the yeast to break down as a reactant of
cell respiration, so no cell respiration took place and no carbon dioxide was produced.
More carbon dioxide was produce in the flask with the sugar because the yeast with the flour needed to
break the flour (polysaccharide) down into the glucose monomers before they could use it for cell
respiration. This takes time, and the yeast only had about 25 minutes. This is why no cell respiration took
place. The yeast with the sugar could immediately use the glucose for cell respiration.