FL Biology EOC - L.18.9 - Cycle of Photosynthesis & Respiration

Photosynthesis and cellular respiration are related (the products of one are the reactants of the other)

• True

• False

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ATP is connected with energy transfers within the cell.

• True

• False

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SC.912.L.18.9

Photosynthesis stores energy while cellular respiration releases energy

• True

• False

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SC.912.L.18.9

Cellular Respiration is used to release energy stored in glucose. Aerobic respiration requires oxygen, whereas anaerobic respiration takes place in the absence of oxygen.

• True

• False

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SC.912.L.18.9

The diagram shows the relationship between photosynthesis and cellular respiration and the organelles in which they occur.

Which statement describes how photosynthesis and cellular respiration are interrelated?

• Oxygen is produced during cellular respiration and stored during photosynthesis.

• Carbon dioxide and water released by cellular respiration are used in photosynthesis.

• Photosynthesis releases the energy that is stored during the process of cellular respiration.

• Glucose is used during cellular respiration to produce food that is broken down during photosynthesis

Answer explanation

The products of cellular respiration (CO2 and H2O) are the reactants of photosynthesis. The overall equations for photosynthesis and cellular respiration are the reverse of each other.

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SC.912.L.18.9

Which gas is removed from the atmosphere during photosynthesis?

• hydrogen

• oxygen

• nitrogen

• carbon dioxide

Answer explanation

The reactants of photosynthesis are carbon dioxide and water.

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SC.912.L.18.9

A weightlifter is using heavy weights in short bursts for a competition. Because his muscle cells are not able to take in enough oxygen to make very much ATP the weightlifter begins to get fatigue in his muscles. Which of the following processes is most likely going on in the muscles of the weightlifter as he competes in his event? 

• As the cells run out of oxygen they switch to anaerobic respiration, which allows the cell to make small amounts of ATP in the absence of oxygen. 

• As the cells run out of oxygen, they die off gradually and the weightlifter's muscles have fewer contracting muscle cells.

• The cells will never run out of oxygen if the weightlifter is breathing.

• As the cells run out of oxygen, they will continue to make the same amount of ATP, since oxygen is not required to make ATP. 

Answer explanation

Anaerobic respiration is used by cells in the absence of ATP. This process converts sugars to alcohol and only creates a small amount of ATP compared to aerobic respiration.

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SC.912.L.18.9

What function does ATP carry out in living things?

• It aids in protein folding and coiling.

• It is used to capture and transfer energy.

• It identifies DNA start sequences for transcription.

• It helps maintain the fluidity of cell membranes.

Answer explanation

ATP is the “energy currency” of cells. Energy is stored in the bonds of this molecule and is released to do work in the cell when the bonds are broken. ATP is created during cellular respiration.

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How are cellular respiration and photosynthesis related, in terms of energy?

• The energy captured in photosynthesis is used to power cellular respiration.

• The energy transformed in cellular respiration is used to power photosynthesis.

• Photosynthesis and respiration perform the same task in terms of energy transformation.

• Energy is not involved in either photosynthesis or cellular respiration.

Answer explanation

Energy from the sun is used captured during photosynthesis and stored in the bonds of glucose molecules. During cellular respiration, this energy transferred to ATP molecules to be used to do work in the cell.

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SC.912.L.18.9

Two different species of bacteria are examined. Scientists find that species X always produces CO2 and H2O during cellular respiration. Species Y always produces ethyl alcohol and CO2. Which conclusion can be made from these observations? 

• Only species Y is aerobic.

• Only species Y is anaerobic.

• Both species X and Y are aerobic.

• Both species X and Y are anaerobic. 

Answer explanation

Anaerobic cellular respiration converts sugars to ethyl alcohol and carbon dioxide in the absence of oxygen.

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