Compare and Contrast the roles of Photosynthesis and Cellular respiration.?

Photosynthesis is the source of chemical energy for essentially all life.  It uses the energy of light from the sun to convert CO2 and H2O into carbohydrates that the plant can use as energy.  When the plant or organisms that consume the plant use the chemical energy from the compounds produced in photosynthesis, it is called cellular respiration.  That process converts sugar or other organic compounds into CO2 and water.  That allows it to be converted into sugar again in the future.  It is called the carbon cycle though it is only a portion of it.  The actual carbon cycle involves plate tectonics where carbon is recycled in volcanoes and usually sequestered in marine deposits.

Photosynthesis is the synthesis of sucrose (sugar) in the presence of sunlight(energy).....consuming carbon dioxide gas and water as reactants while oxygen is release as a by product............on the other hand cellular respiration is the break down of glucose (sugar) at the cellular level consuming oxygen as a reactant and release carbon dioxide gas , water and energy as by product.........both of these processes are reverse of each other..........

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.


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Photosynthesis and cellular respiration are very closely related in many different ways. They both use the electron transport chain, both occur in the autotrophs of the world, both have a lot to do with energy, and they use the same equation(being that the products of cellular respiration are the reactants in photosynthesis, and the products of photosynthesis are the reactants of cellular respiration).

During photosynthesis it uses the electron transport chain to transport the electrons to convert light energy into chemical energy for it to be stored into ATP and NADPH. In respiration, the aerobic respiration uses the electron transport chain to produce ATP and release energy.

Energy plays a very important role in the processes of cellular respiration and photosynthesis. Energy is produced during photosynthesis. Inside of cellular respiration energy is released, but can also produce up to 38 molecules of ATP for the food molecules needed to be inside of the plant and for photosynthesis to start over
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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