Unit 3: Cellular Respiration

How do organisms get the energy they need?

• 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

• by breathing oxygen into the lungs and combining it with carbon dioxide

• by burning food molecules and releasing their energy as heat

Unlike photosynthesis, cellular respiration occurs in

• plant cells only.

• prokaryotic cells only.

• animal cells only.

• all eukaryotic cells.

Cellular respiration is called an aerobic process because it requires

• light.

• oxygen.

• exercise.

• glucose.

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Which of these processes takes place in the cytoplasm of a cell?

• electron transport

• Krebs cycle

• glycolysis

• photosynthesis

In eukaryotes, electron transport occurs in the

• inner mitochondrial membrane.

• nucleus.

• cell membrane.

• cytoplasm.

Cellular respiration uses one molecule of glucose to produce approximately

• 36 ATP molecules.

• 2 ATP molecules.

• 4 ATP molecules.

• 32 ATP molecules.

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When the body needs to exercise for longer than 90 seconds, it generates ATP by carrying out

• lactic acid fermentation.

• cellular respiration.

• alcoholic fermentation.

• glycolysis.

What is the correct equation for cellular respiration?

• 6O₂ + C₆H₁₂O₆ + Energy --> 6CO₂ + 6H₂O

• 6O₂ + C₆H₁₂O₆ --> 6CO₂ + 6H₂O + Energy

• 6CO₂ + 6H₂O --> 6O₂ + C₆H₁₂O₆ + Energy

• 6CO₂ + 6H₂O + Energy --> 6O₂ + C₆H₁₂O₆

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The starting molecule for glycolysis is

• glucose.

• ADP.

• pyruvic acid.

• citric acid.

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The Krebs cycle occurs

• in the cytoplasm.

• in the ribosome.

• in the mitochondrion.

• partly in the cytoplasm and partly in the mitochondrion.