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Photosynthesis and Respiration

Cellular Respiration and Photosynthesis co-exist as paired processes. Photosynthesis converts light energy into organic molecules such as carbohydrates. These molecules are picked up and utilized as fuel sources in organisms that employ Cellular Respiration for production of ATP and CO2.

Although it appears that Photosynthesis has preceded Cellular Respiration by billions of years, the processes share many structural features.

Create a table comparing and contrasting the two processes. Include in your comparison variables such as organism type, energy source, cellular location, substrates/reactants/products, full and balanced chemical reaction, carrier molecules, and any other parameter you find relevant.

Apart from its essential role in cellular respiration, the mitochondrion is thought to be implicated in a variety of disease states as well as the process of ageing. The mitochondrion contains its own circular DNA molecule(s) (termed mtDNA) which largely encodes for proteins localized to the mitochondrion itself. Please provide a hypothesis and suggest an experiment to test the relationship between mtDNA and human ageing. Propose a direction for future research and drug development for targeting mtDNA to combat the ageing process.


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1. Create a table comparing and contrasting the two processes.

Cellular Respiration and Photosynthesis:

“The process of photosynthesis makes glucose. Releasing the spring is like cellular respiration.”

Photosynthesis is a biochemical process in which plants, algae, and some bacteria harness the energy of light to produce food. Ultimately, nearly all living things depend on energy produced from photosynthesis for their nourishment, making it vital to life on Earth. It is also responsible for producing the oxygen that makes up a large portion of the Earth's atmosphere.

6CO_2 (Carbon dioxide - from air) + 6H_2O (Water - from soil) + Light energy (from sun) ---Photosynthesis (Chlorophyll)---> C_6H_12O6 (Glucose - A food) + 6O_2 (Oxygen)

Cellular respiration allows organisms to use (release) the energy stored in glucose. The energy in glucose is first used to produce ATP. Cells use ATP to supply their energy needs. Cellular respiration is therefore a process in which the energy in glucose is transferred to ATP.

Glucose (From Digested Food) + Oxygen (From breathing air) ----Respiration----> Carbon dioxide + Water + Energy

Photosynthesis and respiration are reactions that are opposite to each other. Photosynthesis is a process where food or sugar is formed by absorption of ...

Solution Summary

The solution explains photosynthesis and cellular respiration processes.