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4.1 Chemical Energy and ATP 
KEY CONCEPT 
All cells need chemical energy.
4.1 Chemical Energy and ATP 
The chemical energy used for most cell processes is 
carried by ATP. 
• Molecules in food store chemical energy in their bonds. 
Starch molecule 
Glucose molecule
4.1 Chemical Energy and ATP 
• ATP transfers energy from the breakdown of food 
molecules to cell functions. 
– Energy is released when a phosphate group is removed. 
– ADP is changed into ATP when a phosphate group is 
added. 
phosphate removed
4.1 Chemical Energy and ATP 
Organisms break down carbon-based molecules to 
produce ATP. 
• Carbohydrates are the molecules most commonly broken 
down to make ATP. 
– not stored in large amounts 
– up to 36 ATP from one 
glucose molecule 
adenosine triphosphate 
adenosine diphosphate 
tri=3 
di=2
4.1 Chemical Energy and ATP 
• Fats store the most energy. 
– 80 percent of the energy in your body 
– about 146 ATP from a triglyceride 
• Proteins are least likely to be broken down to make ATP. 
– amino acids not usually needed for energy 
– about the same amount of energy as a carbohydrate
4.1 Chemical Energy and ATP 
A few types of organisms do not need sunlight and 
photosynthesis as a source of energy. 
• Some organisms live in places 
that never get sunlight. 
• In chemosynthesis, chemical 
energy is used to build 
carbon-based molecules. 
– similar to photosynthesis 
– uses chemical energy 
instead of light energy
4.1 Chemical Energy and ATP 
A few types of organisms do not need sunlight and 
photosynthesis as a source of energy. 
• Some organisms live in places 
that never get sunlight. 
• In chemosynthesis, chemical 
energy is used to build 
carbon-based molecules. 
– similar to photosynthesis 
– uses chemical energy 
instead of light energy

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Bio ch04 1

  • 1. 4.1 Chemical Energy and ATP KEY CONCEPT All cells need chemical energy.
  • 2. 4.1 Chemical Energy and ATP The chemical energy used for most cell processes is carried by ATP. • Molecules in food store chemical energy in their bonds. Starch molecule Glucose molecule
  • 3. 4.1 Chemical Energy and ATP • ATP transfers energy from the breakdown of food molecules to cell functions. – Energy is released when a phosphate group is removed. – ADP is changed into ATP when a phosphate group is added. phosphate removed
  • 4. 4.1 Chemical Energy and ATP Organisms break down carbon-based molecules to produce ATP. • Carbohydrates are the molecules most commonly broken down to make ATP. – not stored in large amounts – up to 36 ATP from one glucose molecule adenosine triphosphate adenosine diphosphate tri=3 di=2
  • 5. 4.1 Chemical Energy and ATP • Fats store the most energy. – 80 percent of the energy in your body – about 146 ATP from a triglyceride • Proteins are least likely to be broken down to make ATP. – amino acids not usually needed for energy – about the same amount of energy as a carbohydrate
  • 6. 4.1 Chemical Energy and ATP A few types of organisms do not need sunlight and photosynthesis as a source of energy. • Some organisms live in places that never get sunlight. • In chemosynthesis, chemical energy is used to build carbon-based molecules. – similar to photosynthesis – uses chemical energy instead of light energy
  • 7. 4.1 Chemical Energy and ATP A few types of organisms do not need sunlight and photosynthesis as a source of energy. • Some organisms live in places that never get sunlight. • In chemosynthesis, chemical energy is used to build carbon-based molecules. – similar to photosynthesis – uses chemical energy instead of light energy