Energy, Where does it come
from?
Bio. i
On page 46 of your notebook divide it
into top & bottom
• Label top half of page 46: Where does energy
come from?
• List all the ways you can think of on how we
get energy. Any forms of energy you can think
of.
Class Discussion
• What ways do we get energy? Share your
ideas
How do our cells get energy?
• Our cells get energy from Cellular Respiration
and from Photosynthesis.
• Plants use sunlight to perform photosynthesis
to make glucose. Glucose is then used by the
cell & mitochondria to make ATP.
• ATP is how all of our cells are powered.
• ATP stands for Adenosine Triphosphate
Label the ATP Cycle on the bottom half of
page 46 of your notebook
1) ATP is ready to
release energy
2) The BOND
between the 3rd &
2nd phosphate is
broken, releasing
ENERGY
4) ADP + a phosphate
creates ATP - Ready
to start all over again
3) ADP is a weaker
form of energy, ready
to have a phosphate
added to it
Photosynthesis
• Class discussion
– What occurs during photosynthesis?
What is the chemical formula for photosynthesis?
Sorting Activity page 47 of Notebook
• Cut out each piece and arrange to show the
process of photosynthesis
Your page should look something like this
Photosynthesis Notes
Complete the handout as we go through the notes
and glue it on page 48 of your notebook
Which Organisms Carry Out
Photosynthesis?
• Autotrophs such as plants and some
protists
Photosynthesis
• Photosynthesis is the cellular process in
which autotrophs capture light
energy and convert it to chemical
energy (glucose) using carbon
dioxide and water.
Equation for Photosynthesis
• 6CO2 + 6H2O + Light Energy  C6H12O6 + 6O2
• Carbon Dioxide + Water + Light Energy 
Glucose (sugar) + Oxygen
Reactants & Products
of Photosynthesis
REACTANTS (what
goes in)
PRODUCTS (what
comes out)
Carbon Dioxide
Glucose (sugar)
Water
Oxygen
Light Energy
Where Does Photosynthesis
Occur?
• Chloroplasts
– Contain chlorophyll in plant cells or
autotrophs that capture different wave
lengths of light
Light Dependent Reaction
(Needs sunlight to happen)
• Occurs in the thylakoid
• Water is absorbed through roots.
• Sunlight enters the chloroplast heating up the
water to where it splits, Hydrogen is saved and
oxygen is released back into the atmosphere
• NADP+ picks up the H+ ions (becoming NADPH)
and moves them to the stroma for the light
independent reaction (Calvin cycle). (NADP+ is a
delivery man of hydrogen, its only job is to transfer H+ to the next
reaction)
Light Dependent Reaction
Thylakoid
Light Independent Reaction –
Calvin Cycle (does NOT need
sunlight to happen)
• Carbon dioxide from the atmosphere enters
• H+ breaks off from NADPH
of hydrogen)
(NADP+ is a delivery man
• NADP+ returns to the Light Dependent
Reaction to gather more H+
• Carbon dioxide (CO2) becomes “fixed” with
the H+ producing the glucose molecule
C6H12O6.
Light Dependent / Calvin Cycle
Summarize photosynthesis
• Class discussion
What do we do with the
glucose/starch when we eat plants??
• Class discussion
Mitochondria & Cellular Respiration
Mitochondria & Cellular Respiration
Found in Both Plants & Animals
Mitochondria & Cellular Respiration
Found in Both Plants & Animals
Breaks down GLUCOSE
into ENERGY
Mitochondria & Cellular Respiration
Found in Both Plants & Animals
Breaks down GLUCOSE
into ENERGY
Chemical formula is the same as
photosynthesis but in reverse
Cellular Respiration
Cellular Respiration Foldable
Create a pyramid foldable this will go on page 49
Use the foldable to complete your notes
Glycolysis
• Happens in the cytoplasm (cytosol) of the cell
• We put in 2 ATP to start the process
• We make 4 ATP and break the glucose down
into 2 molecules of pyruvate
Since we paid 2 ATP up front
to start the process we only
Gained 2 ATP
From glycolysis we get
- 2 ATP
- 2 pyruvate
- 2 NADH (goes to ETC)
Pyruvate now travels to the mitochondria
The Krebs Cycle / Citric Acid Cycle
•
•
•
•
•
Occurs inside the mitochondria
Is an aerobic process, NEEDS OXYGEN to work
Breaks down the pyruvate into acetyl-CoA
Net yield of 2 ATP
Net yield of 6 NAHD & 2 FADH2 (this will help run the next
process)
• Releases Carbon dioxide as waste
Electron Transport Chain
• Final stage of Cellular
Respiration
• Takes place in the
mitochondria
• Electrons are released from
NADH & FADH2 as they
pass through the inner
mitochondrial membrane,
as they go through
electrons give up energy to
create 28-32 ATP
• Hydrogen is also combined
with Oxygen to form water
Net Yield of each process
Page 50
• Fill out the Photosynthesis Cellular Respiration
Chart