Name _______________________________ Date _________________ Pd _____
Chapter 8: Photosynthesis
Section 1: Energy and Life (pages 192-194)
Objectives: SWBAT…
1. Explain the importance of ATP.
2. Explain the purpose of photosynthesis.
Chemical Energy
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Energy is _________________________________________________.
Living things need ________________________.
o Energy is used to
 _________________________ new molecules
 Get rid of _____________________
Energy Changes Form
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Three forms of energy include _______________________________________.
_________________________ is also another form of energy.
o Energy is stored in ____________________________________.
o _________________ bonds are broken and/or formed.
o If _____________________ energy is available after new bonds are formed,
the energy can _______________________________.
o Extra energy becomes ______________ and _____________.
ATP
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Living things use ______________________ energy.
One of the most important chemicals that cells use to store and give off energy is called
___________________________________.
ATP is made of _______________________, a sugar called _______________,
and _______ phosphate groups.
**Label the parts of the ATP molecule above**
Storing Energy
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Adenosine ___________________________ (ADP) is similar to ATP.
ADP has _______ phosphate groups instead of _____________.
Extra energy is stored in small amounts by adding a ____________________ group
to _________ to turn it to ________.
Releasing Energy
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Cells can give off the energy stored in ATP by _______________ the chemical bonds
between the second and _______________ phosphate groups.
Cells add or _____________________ these phosphate groups whenever it needs to
store or use energy.
Using Chemical Energy
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Cells use __________ in many ways:
o to power ___________________ transport.
**Review** Active transport is the movement of particles ______________________ the
concentration gradient (________ concentration to ___________ concentration)
o to move ________________________ into and out of many cells.
o to help muscles _________________________.
o for _________________, twisting and ____________________ for cells.
Short-Term Storage
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Most cells have only a small amount of ________.
ATP is great for ______________________ a small amount of energy very quickly.
ATP is NOT good for __________________ large amounts of energy for a long time.
The sugar _____________________ is much better for energy storage.
Cells can use glucose to make _________ and ________ as needed.
ATP Comes from Food
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Once cells use up their supply of ATP, they must __________________________.
Energy to make more ATP comes from _________________________ called food.
Heterotrophs Eat Food
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Heterotrophs are living things that get food by _______________ other living things.
o some are herbivores – get their food by eating ________________________
o others are carnivores – get food by eating other _______________________
o others are detrivores – get food by breaking down tissues of _________ things.
Autotrophs Make Food
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Energy in nearly all food ____________________ first came from the _________.
Plants, _____________________, and some bacteria use light energy from the sun
to make their own ______________________
__________________________ are organisms that make their own food.
All life depends on autotrophs to get energy from _____________________ and
store it in _____________________________ that make up food
**Review** ____________________________ are carbon compounds that are used as
a primary source of energy

________________________________ is the process used by autotrophs to use
energy from sunlight to produce high-energy carbohydrates such as sugars and starches.
Diagram – draw simple diagrams that summarize 1) the change of energy from light to
chemical energy by autotrophs and 2) the changing of ADP to ATP.