CHAPTER 9
LESSON
1Energy and Life
Chemical Energy and ATP
KEY QUESTION Why is ATP useful to cells?
Cells require energy to perform work, and energy makes life
possible. We humans cannot use sunlight as a source of energy,
but must take in food made by other organisms, plant or animal,
to acquire energy. We are heterotrophs.
HeadingMain Idea
Chemical Energy and ATPChemical energy is contained in the bonds between atoms.
ATP is the molecule that organisms use to temporarily store
energy.
• Storing Energy
• Releasing Energy
• How Cells Use ATP
Heterotrophs and Autotrophs
As you read, circle
the answers to each Key
Question. Underline any
words you do not understand.
READING TOOL Main Idea As you read the lesson, complete the main idea
table for each heading. The first one has been completed for you.
Lesson Summary
Copyright Copyright © by Savvas Learning Company LLC. All Rights Reserved.106 Chapter 9 Photosynthesis
heterotrophs get ATP from eating other organisms
while autotrophs get ATP from producing it.
all living cells store ATP
cells use ATP to carry out active transport
Atp can release energy by breaking bonds .
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CHAPTER 9LESSON1Energy and LifeChemical Energy and ATPKEY QUESTIONWhy is ATP useful to cells?Cells require energy to perform work, and energy makes lifepossible. We humans cannot use sunlight as a source of energy,but must take in food made by other organisms, plant or animal,to acquire energy. We are heterotrophs.HeadingMain IdeaChemical Energy and ATPChemical energy is contained in the bonds between atoms.ATP is the molecule that organisms use to temporarily storeenergy.• Storing Energy• Releasing Energy• How Cells Use ATPHeterotrophs and AutotrophsAs you read, circlethe answers to each KeyQuestion. Underline anywords you do not understand.READING TOOLMain IdeaAs you read the lesson, complete the main ideatable for each heading. The first one has been completed for you.Lesson SummaryCopyrightCopyright © by Savvas Learning Company LLC. All Rights Reserved.106Chapter 9Photosynthesis
Energy comes in many forms, including light, heat, andelectricity. Energy can be stored in chemical compounds, too.For example, when you light a candle, the wax melts, soaks intothe wick, and is burned. As the candle burns, chemical bondsbetween carbon and hydrogen atoms in the wax are broken.New bonds then form between these atoms and oxygen,producing CO2and H2O (carbon dioxide and water). These newbonds are at a lower energy state than the original chemicalbonds in the wax. The energy is released as heat and light inthe glow of the candle’s flame.
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Adenosine triphosphate