Answers First Semester BiologyPhotosynthesis and Cellular Respiration

Photosynthesis and Cellular Respiration — Unit test Answers

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Which statement correctly compares and contrasts the three stages of cellular respiration that occur in the presence of oxygen?

Each stage occurs in the mitochondria, but only the final stage produces ATP.

Each stage produces ATP, but only the third stage occurs in the mitochondria.

Each stage produces ATP, but only the first stage occurs in the cytoplasm.

Each stage occurs in the cytoplasm, but only the final stage produces ATP.

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Cells use different processes at different times to provide an organism with the energy that it needs. Spirulina is an autotrophic bacteria that can be found in freshwater and marine environments. Which process takes place in the cells of Spirulina that does not occur in the cells of a human?

photosynthesis

aerobic respiration

anaerobic respiration

cellular respiration

Which component of Earth’s atmosphere is decreased due to photosynthesis?

ozone

oxygen

hydrogen peroxide

carbon dioxide

The graphic below shows how photosynthesis and cellular respiration are related.Which label in the graphic represents the energy that is released from glucose by cellular respiration?

Oxygen

Glucose

Energy stored as ATP

Carbon dioxide and water

A scientist hypothesized that oxygen atoms from both carbon dioxide and water are used to make glucose during photosynthesis. However, experimental results using oxygen isotopes showed that all of the oxygen from the water ended up in the oxygen molecules that were produced. None of the oxygen from water was found in glucose. What should the scientist do to best gain scientific understanding of this topic?

Analyze the results, and change the experimental methods to retest the hypotheses in a different way.

Discard the faulty results that do not support the original hypothesis, and repeat the experiment using the same methods.

Analyze the procedural errors that took place in the experiment, and summarize these in a conclusion statement.

Repeat the experiment and adjust new data to support the original hypothesis.

The graph shows the number of calories that two people burn while they perform various exercises for one hour each.Which conclusion is supported by the graph?

The 200-pound person burns more calories per hour doing aerobics than doing any other exercise shown.

The 160-pound person burns about 50 calories per mile while jogging.

The 200-pound person would need to play volleyball for three hours to burn the same number of calories as he burns in one hour of basketball.

The 160-pound person burns about twice as many calories jogging as she does walking.

During photosynthesis, the energy from sunlight is used to split water molecules. What happens to the hydrogen ions that are split from the water molecules?

They flow out of the thylakoid, providing energy to add a phosphate group to ADP.

They build up in the thylakoid, providing energy to break apart ATP molecules.

They build up in the thylakoid, where they bond to each other to create ATP.

They flow out of the thylakoid, where they stimulate enzymes to break apart ATP.

Which organism would be the best subject for a study of both photosynthesis and cellular respiration?

a green plant

a chemosynthetic bacterium

an animal that eats plants

an animal that eats animals

Mira analyzed oxygen and carbon dioxide in inhaled and exhaled air. She found that the percentages of both gases were different in each. What other gas would most likely also have different amounts in inhaled and exhaled air?

ozone (O3)

hydrogen (H2)

water vapor (H2O)

sulfur dioxide (SO2)

During which step of cellular respiration is the most ATP produced?

Krebs cycle

glycolysis

photosynthesis

electron transport chain

Which statement correctly compares the body’s energy storage molecules?

Glycogen is the body’s main source of energy, but lipids contain most of the body’s stored energy.

Glycogen is the body’s main source of energy, but proteins contain most of the body’s stored energy.

Lipids are the body’s main source of energy, but glycogen contains most of the body’s stored energy.

Proteins are the body’s main source of energy, but lipids contain most of the body’s stored energy.

The chemical reaction equation of photosynthesis is shown here:6CO2 + 6H2O C6H12O6 + 6O2What information is not given in this equation.

It does not show if the reaction is reversible

It does not show the reactants needed for the reaction

It does not show that photosynthesis consists of many separate steps.

It does not show the number of molecules required to produce glucose.

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Photosynthesis and Cellular Respiration — Unit test Answers

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