SCI/230 Cell worksheet

Topics: Adenosine triphosphate, Cellular respiration, Photosynthesis Pages: 4 (885 words) Published: September 30, 2013
Associate Program Material

Cell Energy Worksheet

Answer the following questions:

Cellular respiration:

What is cellular respiration and what are its three stages? Cellular respiration is a metabolic process that all living organisms use to harvest from foods in the form of adenosine triphosphate. There are three stages of cellular respiration-glycolysis, citric acid cycle, and electron transport chain.

What is the role of glycolysis? Include the reactants and the products. Where does it occur? The role of glycolysis it to turn glucose molecule into energy by breaking it down in to two three carbon molecules. During this process two molecules of ATP, two molecules of pyruvic acid and two NADH molecules are produced. This process occurs in the ytoplasm of a cell, outside the mitochondrion.

What is the role of the citric acid cycle? Include the reactants and the products. Where does it occur? The citric acid cycle begins after the first stage of glycolysis is completed. The two carbon molecules are converted into acetyl CoA compound. Two ATPs are produced per each molecule of glucose by the citric acid cycle. When these compounds are reduced, they are transported by electron carriers to the next stage. The citric acid cycle occurs only when oxygen is present in the mitochondrion after the cell splits during the first phase glycolysis.

What is the role of the electron transport system? Include the reactants and the products. Where does it occur? The electron transport system is the final stage in cell respiration. The main role is to transport electrons formed from NADH to oxygen in order to release the energy cells use to make ATP.

Photosynthesis:

What is the overall goal of photosynthesis?
The overall goal of photosynthesis is to convert light energy from the sun into a chemical energy of sugar and other organic molecules. For example, apple trees use photosynthesis to produce both oxygen and fruit. Animal life needs oxygen to...
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