How do organisms get the energy they need?

• by burning food molecules and releasing their energy as heat
• by breathing oxygen into their lungs and combining it with carbon dioxide
• by breaking down food molecules gradually and capturing their chemical energy
• by using the sun's energy to break down food molecules and form chemicals

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Which of the following is NOT a stage of cellular respiration?

• fermentation
• electron transport
• glycolysis
• Krebs cycle

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Which compounds are produced by the two main types of fermentation? 

• NAD+ or ATP
• alcohol or lactic acid
• glucose or carbon dioxide
• ADP or ATP

Cellular respiration is called an aerobic process because it requires

• light
• exercise
• oxygen
• glucose

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Cellular respiration benefits organisms by 

• forming carbon dioxide
• breaking down glucose
• transferring energy to ATP
• consuming oxygen

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Photosynthesis is to chloroplasts as cellular respiration is to

• chloroplasts
• cytoplasm
• mitochondria
• nuclei

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The most important product of the electron transport chain in cellular respiration is 

• ATP
• NADH
• ADP
• NAD+

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The products of photosynthesis are the

• products of cellular respiration
• reactants of cellular respiration
• products of glycolysis
• reactanta of fermentation

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 In glycolysis, each glucose molecule is broken down into 

• six molecules of carbon dioxide
• four molecules of ATP
• two molecules of pyruvic acid
• two molecules of ATP

 Each of the following processes releases energy from glucose EXCEPT 

• photosynthesis
• glycolysis
• cellular respiration
• fermentation

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