Finish for homework! Due tomorrow.
Warm-up
1. Choose lab partner.
2. Take out scratch paper and pencil.
3. If you have one, take out cell phone and set to
stopwatch….
Warm-up
1. Add 150 mL bromothymol blue to flask.
– Turns blue to yellow in presence of carbon dioxide
– Turns yellow to blue in presence of oxygen.
2. Using straw, time how long it takes one person to
turn solution yellow. Record time.
3. Pour yellow solution into “Used” jar. Refill with
150 mL of blue solution.
4. Run up & down steps to 2nd floor 8 times!
5. Have same person repeat step 2.
time before: __________
time after: __________
Results
• Which time was shorter, before or after?
• Why did it take less time to change the
bromothymol blue to yellow after exercising?
• Why was your body producing more carbon
dioxide the second time?
Notes: Cellular Respiration
Essential Questions:
1. How do our cells determine who we are?
2. How do living things obtain and use
energy?
1. What is photosynthesis and why is it important to all life
on Earth?
• Photosynthesis = the way plants use light energy to make food
(sugar).
• Photosynthesis at beginning of almost all food chains. Without it,
food chains would collapse.
X
X
X
X
X
2. Write the chemical equation for photosynthesis using
symbols and words.
6CO2 + 6H2O + (energy)
Carbon
dioxide
water
reactants
light
C6H12O6 + 6O2
glucose
oxygen
products
3. What is ATP and how do cells use it for energy?
• Molecule that stores and releases energy for cells
Energy released by breaking bond
Between 2nd and 3rd phosphate
Energy stored by adding 3rd phosphate
4. What is cellular respiration?
• The way cells break down glucose (sugar) to
release energy.
5. What is the relationship between cellular respiration,
glucose, mitochondria, and ATP?
• Glucose = the sugar broken down for energy in cell
respiration.
• Mitochondria = where cell resp. happens in cells.
• ATP = the form of energy cells get from breaking
down glucose.
6. Write the chemical equation for cellular respiration
using symbols and words.
C6H12O6 + 6O2
glucose
oxygen
6CO2 + 6H2O + energy
Carbon
dioxide
water
ATP
7. Photosynthesis and cell respiration are usually
thought of as opposite processes. Explain why this is so.
• Photosynthesis produces sugar, cell resp. is breaking
down of sugar.
• Photosynthesis stores energy, CR releases energy
• Chemical reactions are mirror images of each other
8. The Law of Conservation of Matter states that matter cannot be
created or destroyed; it can only be rearranged. Explain how the
chemical equations for photosynthesis and cell respiration illustrate
this. In both cases, we are not creating or destroying atoms;
just taking apart molecules and reassembling atoms
into different forms.
6CO2 + 6H2O + (energy)
C6H12O6 + 6O2
9. Why is it that we die without oxygen? What do your
cells do with oxygen that your life depends on?
• Cells need oxygen to break down glucose to get
energy for life processes.
• Cells burn glucose for energy the same way a candle
burns wax. Both need oxygen to react….
10. Summarize the work of a red blood cell as it circulates
through your heart, lungs, and brain. Be sure to indicate where
gas exchanges of oxygen (O2) and carbon dioxide (CO2) take
place.
brain
1. RBC goes from heart to
lungs.
2. At lungs, RBC gets rid of
CO2 , picks up O2.
3. RBC goes back to heart,
which pumps it to brain.
4. At brain, RBC gets rid of
O2 , picks up CO2.
5. RBC goes back to heart.
6. Repeat cycle
lung
heart
lung
rest of body
11. One fundamental principle in biology is the idea
that “life runs on sugar.” Apply what you have learned
about photosynthesis and cell respiration to explain
what this means in your own words.
Photosynthesis provides
sugar for plants at base
of almost all food chains.
Cell respiration is how all
living things break down
sugar for energy.
Results
• Which time was shorter, before or after?
• Why did it take less time to change the
bromothymol blue to yellow after exercising?
• Why was your body producing more carbon
dioxide the second time?
Videos
Photosynthesis and Cell Respiration (5 min)
http://ed.ted.com/lessons/the-simple-but-fascinatingstory-of-photosynthesis-and-food-amanda-ooten
How Cells Get Energy (14 min)
http://www.youtube.com/watch?v=i8c5JcnFaJ0
Videos
What does your pancreas do?
http://ed.ted.com/lessons/what-does-the-pancreas-do-emmabryce?utm_source=TED-Ed+Subscribers&utm_campaign=53bd6afe7a2013_09_219_19_2013&utm_medium=email&utm_term=0_1aaccced48-53bd6afe7a46516589
Exit Slip
Q: What is cell respiration and why is it important
to all life on Earth?
A:
Your name at bottom