Cell Energy Essay

960 words - 4 pages

Associate Program Material

Cell Energy Worksheet

Answer the following questions:

Cellular respiration:

• What is cellular respiration and what are its three stages?

Cell respiration is the most efficient way for cells to harvest energy stored in food. It is a catabolic pathway for the production of adenosine triphosphate also known as ATP. ATP is a high energy molecule, and is also expended by the working cells. Cellular respiration occurs in both eukaryotic and prokaryotic cells and has three main stages which include glycolysis, the citric acid cycle, and electron transport.

• What is the role of glycolysis? Include the reactants and the products. ...view middle of the document...

The reduced forms carry the high energy electrons to the next stage. Unlike glycolysis, The Citric Acid Cycle occurs only when oxygen is present but it doesn't use oxygen directly.

• What is the role of the electron transport system? Include the reactants and the products. Where does it occur?

The electron transport system requires direct oxygen which is different than the other two stages and occurs in the Mitochondria Membrane. The electron transport chain is a series of electron carriers in the membrane of the mitochondria in eukaryotic cells. Through a series of reactions the high energy electrons are passed to oxygen. In the process, a gradient is formed and ultimately ATP is produced.

Photosynthesis:

• What is the overall goal of photosynthesis?

The goal of photosynthesis is so that plants, some bacteria, and some protistans use the energy from sunlight to produce sugar, which cellular respiration converts into ATP so that the fuel is used by all living things. It is the conversion of unusable sunlight energy into usable chemical energy, is associated with the actions of the green pigment chlorophyll. The photosynthetic process uses water and then releases the oxygen that we must have to stay alive and survive.

• Because photosynthesis only occurs in plants, why is it essential to animal life?
Photosynthesis is a process by which green plants and certain other organisms use the energy of light to convert carbon dioxide and water into the simple sugar glucose. In doing so, photosynthesis provides the basic energy source for virtually all organisms. An extremely important byproduct of photosynthesis is oxygen, on which most organisms depend.

• What is the role of the light reactions? Include the reactants and the products. Where does it occur?
In the light reactions chlorophyll in the thylakoid membranes solar energy which then is converted to the chemical energy of NADPH and ATP.

• What is the role of the Calvin cycle? Include the reactants and the products. Where does it occur?

The...

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