Free «Photosynthesis and Cellular Respiration» Essay Sample

Purpose of Glycolysis

Every cell in the body requires energy to function effectively. Some cells like the brain cells have spaces to store glucose or ATP, which provide energy. Therefore, the cells require constant supply of glucose through the blood to provide energy. The glucose has to be converted into energy through the energy producing reactions. Glycolysis is one of the energy producing reactions, which produce energy (Wiley, n.d.). The process of glycolysis uses ATP from the cells, which later in the process are replaced. Glycolysis leads to the formation NAD, which is a source of energy. The final products of glycolysis are molecules of pyruvate (Wiley, n.d.).

Purpose of Krebs cycle

The Krebs cycle takes place in the mitochdria of the cell, and produces energy for the cell. The molecules of pyruvate produced in the glycolysis stage enter the Krebs cycle. Pyruvate molecules loose carbon to form carbon dioxide and acetyl (Wiley, n.d.). The acetyl combines with a coenzyme A, and looses hydrogen to form acetyl CoA. Hydrogen reduces NAD to NADH, which is a source of energy.

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Purpose of Electron Transport System

 Inside the electron transport system, the electrons help to pump the protons into the space between the mitochdria membranes. Some electrons later combine with oxygen and protons to form water (Wiley, n.d.). The accumulated protons have energy, which is used to breakdown ATP.

Purpose of ATP

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ATP is synthesized to form energy required by the cells for their functions. The phosphate in ATP is broken to form ADP, which is a usable form of energy (Wiley, n.d.).

Purpose of Chloroplast

Chloroplast is important because it is responsible for the photosynthetic conversion of carbon dioxide to carbohydrates. Chloroplast is important as it provides the medium for the synthesis of fatty acids and amino acids.

Differences between Light and Dark Cellular Respiration Processes

Light dependent cellular respiration process takes place in the presence of light whereas dark respiration process takes place without light. The light stage produces ATP and NADH as forms of energy whereas dark cellular respiration produces only ATP as the form of energy (Wiley, n.d.). Both processes are necessary as they end in the production of energy required by living organisms for survival.

If humans were to become autotrophs, they would no longer depend on green plants for food. This would make life easier as people would not struggle looking for food (Lawlor, 1993).


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