Photosynthesis and Cellular Respiration

A diagram representing the relationship between photosynthesis and cellular respiration is shown below.

1 - oxygen; 2 - carbon dioxide Photosynthesis by plants produces oxygen, which is then used by animals as a reactant in cellular respiration. The product of cellular respiration is carbon dioxide, which is used by plants in photosynthesis. And the cycle continues.

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. 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.

Which statement describes how photosynthesis and cellular respiration are interrelated?

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

Cell theory was first proposed in 1838. Evidence obtained through additional scientific investigations resulted in the current cell theory. Which statement describes a component of the original cell theory that was removed because of the new scientific knowledge?

Cells form through spontaneous generation. It was once believed that cells could form on their own. We now know that cells must form from preexisting cells.

What function does ATP carry out in living things?

It is used to capture and transfer energy. 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.

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

In which way are photosynthesis and cellular respiration different?

Photosynthesis used carbon dioxide, while cellular respiration produces carbon dioxide. The reactants of photosynthesis are the products of cellular respiration.

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

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

Which gas is removed from the atmosphere during photosynthesis?

carbon dioxide The reactants of photosynthesis are carbon dioxide and water.